Fix LedgerDB OnDisk tests block generator
The block generators consumed the same token that was generated instead
of the input token.
The fix can be confirmed by looking at the length of the chains before a
restore command (see `TagRestore`) or a drop command (see `TagMaxDrop`).
Before the fix:
```
Storage
LedgerDB
OnDisk
LedgerSimple: OK (0.01s)
+++ OK, passed 100 tests.
Tags (228 in total):
6.6% TagMaxRollback = (k = 2) >> 0
6.6% TagRestore Nothing = (k = 1) >> 0
6.1% TagRestore Nothing = (k = 2) >> 0
5.7% TagMaxDrop = (k = 0)
5.7% TagMaxDrop = (k = 1) >> 0
5.7% TagMaxDrop = (k = 3) >> 0
5.7% TagMaxRollback = (k = 0)
5.3% TagMaxDrop = (k = 2) >> 0
5.3% TagMaxRollback = (k = 1) >> 0
4.8% TagMaxRollback = (k = 3) >> 0
4.8% TagRestore Nothing = (k = 0)
4.4% TagMaxRollback = (k = 6) >> 0
4.4% TagRestore Nothing = (k = 3) >> 0
4.4% TagRestore Nothing = (k = 6) >> 0
3.9% TagMaxDrop = (k = 6) >> 0
3.9% TagRestore Nothing = (k = 5) >> 0
3.5% TagMaxDrop = (k = 4) >> 0
3.5% TagMaxDrop = (k = 5) >> 0
3.5% TagMaxRollback = (k = 5) >> 0
3.5% TagRestore Nothing = (k = 4) >> 0
2.6% TagMaxRollback = (k = 4) >> 0
```
```
ouroboros-storage
Storage
LedgerDB
OnDisk
LedgerSimple: OK (0.03s)
+++ OK, passed 100 tests.
Tags (253 in total):
5.5% TagMaxRollback = (k = 0)
2.4% TagMaxDrop = (k = 0)
2.0% TagMaxRollback = (k = 1) >> 0
1.6% TagMaxDrop = (k = 0) >> 2
1.6% TagMaxDrop = (k = 3) >> 1
1.6% TagMaxDrop = (k = 4) >> 3
1.6% TagMaxRollback = (k = 1)
1.6% TagMaxRollback = (k = 3) >> 0
1.2% TagMaxDrop = (k = 1) >> 0
1.2% TagMaxDrop = (k = 2) >> 1
1.2% TagMaxDrop = (k = 4) >> 2
1.2% TagMaxDrop = (k = 5) >> 0
1.2% TagMaxDrop = (k = 6) >> 0
1.2% TagMaxRollback = (k = 2)
1.2% TagMaxRollback = (k = 2) >> 0
1.2% TagMaxRollback = (k = 3) >> 2
1.2% TagMaxRollback = (k = 4)
1.2% TagMaxRollback = (k = 5) >> 2
1.2% TagMaxRollback = (k = 6) >> 0
1.2% TagMaxRollback = (k = 6) >> 1
1.2% TagMaxRollback = (k = 6) >> 3
1.2% TagMaxRollback = (k = 6) >> 4
1.2% TagRestore Nothing = (k = 0) >> 1
1.2% TagRestore Nothing = (k = 0) >> 3
1.2% TagRestore Nothing = (k = 1) >> 0
1.2% TagRestore Nothing = (k = 3) >> 0
1.2% TagRestore Nothing = (k = 3) >> 1
1.2% TagRestore Nothing = (k = 3) >> 2
1.2% TagRestore Nothing = (k = 4)
1.2% TagRestore Nothing = (k = 4) >> 0
1.2% TagRestore Nothing = (k = 6)
1.2% TagRestore Nothing = (k = 6) >> 2
0.8% TagMaxDrop = (k = 0) >> 3
0.8% TagMaxDrop = (k = 0) >> 4
0.8% TagMaxDrop = (k = 1)
0.8% TagMaxDrop = (k = 1) < 7
0.8% TagMaxDrop = (k = 2)
0.8% TagMaxDrop = (k = 2) >> 4
0.8% TagMaxDrop = (k = 3)
0.8% TagMaxDrop = (k = 5) < 12
0.8% TagMaxDrop = (k = 5) >> 1
0.8% TagMaxDrop = (k = 6) < 13
0.8% TagMaxDrop = (k = 6) > 1
0.8% TagMaxRollback = (k = 3) >> 1
0.8% TagMaxRollback = (k = 4) >> 1
0.8% TagMaxRollback = (k = 4) >> 2
0.8% TagMaxRollback = (k = 4) >> 3
0.8% TagMaxRollback = (k = 5)
0.8% TagMaxRollback = (k = 5) >> 4
0.8% TagMaxRollback = (k = 6) >> 2
0.8% TagRestore (Just SnapOk) = (k = 1) >> 2
0.8% TagRestore (Just SnapOk) = (k = 1) >> 3
0.8% TagRestore (Just SnapOk) ≈ (k = 0) << 8
0.8% TagRestore (Just SnapOk) ≈ (k = 1) << 9
0.8% TagRestore Nothing = (k = 0) >> 2
0.8% TagRestore Nothing = (k = 1) < 6
0.8% TagRestore Nothing = (k = 2)
0.8% TagRestore Nothing = (k = 2) >> 0
0.8% TagRestore Nothing = (k = 2) >> 1
0.8% TagRestore Nothing = (k = 3)
0.8% TagRestore Nothing = (k = 4) >> 2
0.8% TagRestore Nothing = (k = 5) >> 2
0.8% TagRestore Nothing = (k = 5) >> 3
0.8% TagRestore Nothing = (k = 6) < 13
0.8% TagRestore Nothing = (k = 6) >> 3
0.8% TagRestore Nothing ≈ (k = 6) << 14
0.4% TagMaxDrop = (k = 0) >> 1
0.4% TagMaxDrop = (k = 1) < 6
0.4% TagMaxDrop = (k = 1) >> 2
0.4% TagMaxDrop = (k = 1) >> 4
0.4% TagMaxDrop = (k = 2) >> 0
0.4% TagMaxDrop = (k = 3) < 11
0.4% TagMaxDrop = (k = 3) < 9
0.4% TagMaxDrop = (k = 3) >> 0
0.4% TagMaxDrop = (k = 3) >> 2
0.4% TagMaxDrop = (k = 4) < 12
0.4% TagMaxDrop = (k = 4) < 9
0.4% TagMaxDrop = (k = 4) >> 0
0.4% TagMaxDrop = (k = 4) >> 1
0.4% TagMaxDrop = (k = 5) >> 3
0.4% TagMaxDrop = (k = 6)
0.4% TagMaxDrop = (k = 6) < 15
0.4% TagMaxDrop = (k = 6) >> 1
0.4% TagMaxDrop = (k = 6) >> 2
0.4% TagMaxDrop = (k = 6) >> 3
0.4% TagMaxDrop = (k = 6) >> 4
0.4% TagMaxDrop ≈ (k = 0) << 16
0.4% TagMaxRollback = (k = 2) >> 1
0.4% TagMaxRollback = (k = 3)
0.4% TagMaxRollback = (k = 4) >> 0
0.4% TagMaxRollback = (k = 5) >> 1
0.4% TagMaxRollback = (k = 6)
0.4% TagRestore (Just SnapCorrupted) = (k = 0) >> 4
0.4% TagRestore (Just SnapCorrupted) = (k = 1) >> 2
0.4% TagRestore (Just SnapCorrupted) = (k = 4)
0.4% TagRestore (Just SnapCorrupted) = (k = 5) < 15
0.4% TagRestore (Just SnapCorrupted) ≈ (k = 0) << 8
0.4% TagRestore (Just SnapCorrupted) ≈ (k = 1) << 9
0.4% TagRestore (Just SnapCorrupted) ≈ (k = 3) << 11
0.4% TagRestore (Just SnapCorrupted) ≈ (k = 6) << 14
0.4% TagRestore (Just SnapOk) = (k = 0) < 5
0.4% TagRestore (Just SnapOk) = (k = 0) >> 1
0.4% TagRestore (Just SnapOk) = (k = 0) >> 2
0.4% TagRestore (Just SnapOk) = (k = 2) < 7
0.4% TagRestore (Just SnapOk) = (k = 3) < 8
0.4% TagRestore (Just SnapOk) = (k = 4) < 11
0.4% TagRestore (Just SnapOk) = (k = 4) < 12
0.4% TagRestore (Just SnapOk) = (k = 5) < 11
0.4% TagRestore (Just SnapOk) = (k = 5) < 15
0.4% TagRestore (Just SnapOk) = (k = 6) < 15
0.4% TagRestore (Just SnapOk) = (k = 6) < 16
0.4% TagRestore (Just SnapOk) ≈ (k = 3) << 11
0.4% TagRestore (Just SnapOk) ≈ (k = 5) << 21
0.4% TagRestore Nothing = (k = 0)
0.4% TagRestore Nothing = (k = 0) < 5
0.4% TagRestore Nothing = (k = 0) >> 4
0.4% TagRestore Nothing = (k = 1)
0.4% TagRestore Nothing = (k = 1) < 7
0.4% TagRestore Nothing = (k = 1) >> 3
0.4% TagRestore Nothing = (k = 1) >> 4
0.4% TagRestore Nothing = (k = 2) < 7
0.4% TagRestore Nothing = (k = 2) < 8
0.4% TagRestore Nothing = (k = 2) >> 3
0.4% TagRestore Nothing = (k = 3) < 8
0.4% TagRestore Nothing = (k = 4) < 13
0.4% TagRestore Nothing = (k = 4) < 9
0.4% TagRestore Nothing = (k = 4) >> 1
0.4% TagRestore Nothing = (k = 5) < 11
0.4% TagRestore Nothing = (k = 5) < 12
0.4% TagRestore Nothing = (k = 5) < 13
0.4% TagRestore Nothing = (k = 5) >> 1
0.4% TagRestore Nothing = (k = 6) >> 0
0.4% TagRestore Nothing ≈ (k = 0) << 8
0.4% TagRestore Nothing ≈ (k = 5) << 13
```
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