697: Remove inconsistent
insertedAtTime lens. r=piotr-iohk a=jonathanknowles
This lens is not quite correct, as the setter updates the slot ID to
(1, 1) regardless of what time is specified. Using the setter could lead to inconsistency between the slot ID and the time.
Luckily, since we only need the getter functionality, we can remove the lens and replicate the functionality with simple function composition.
Co-authored-by: Jonathan Knowles [email protected]