Update overlap.py to fix_factorial2

[LudoRNLT]

@D-TheProgrammer and I, think that we solved the factorial error. Let us know if we have to do this but in a different way or use another syntax.

[D-TheProgrammer]

Hi @PaulWAyers and @FarnazH , @LudoRNLT and I wanted to know if you have any updates regarding our fix and if it still suits you for the merge.

[PaulWAyers]

I think @FarnazH is busy. Perhaps @tovrstra or @marco-2023 has time to do a quick review.

[tovrstra]

@D-TheProgrammer: can you explain the error you were getting and that was fixed with this change? I just ran all unit tests without this change, and they pass (except for the problem fixed in #310).

Edit: sorry found it #308

[tovrstra]

I'm closing this one because a more recent pull request was made: #319