[FIXED] Set genetic stability base back to 120 (or make it safe to have one power)

[RelentlessGarbage]

I pulled this up from the github page. Not sure if this is specifically what people have been referring to when speaking of getting "free stability," or if it was just a one-off bug, but I'd agree that having to rely on arcane features/bugs in order to "do genetics correctly" is silly and makes genetics worse overall:
https://github.com/goonstation/goonstation/issues/12812

This has turned up as a problem before, where it was apparently fixed:
https://github.com/goonstation/goonstation/issues/8297