Now checks sub-LVLN as if they are already patched

[FrederikRasmussen]

Hey,

The following changes creates a new lvlnGender function that attempts a "positive look-ahead" where instead of assigning, Male, Female, or Mixed, it instead assigns Male or Female, as if we deleted all instances of Male already (or Female, if the deFem setting is true).

This avoids the reported issue of levelled lists becoming empty, which was caused by levelled lists that consisted entirely of Mixed genders having all entries removed.

In addition to the above, we no longer attempt to fix a LVLN that will inevitably becomes all Male (or Female, if the deFem setting is true), though I haven't been able to test this, as I do not have any mods where this would occur, and the base game similarly does not have a test case.