Were using default filter behavior, which needs to be tweaked to account
for the original met location/level not being present (ie skip the
minLevel bounds check).
Hardcode logic for HasOriginalMetLocation for simplicity
Closes#2389 , thanks @Ammako !
Now logic is reasonably split, and each format of area has its own way
of yielding slots
Too much junk with checking flute boosts or catch combo applicability;
just let the area dictate how slots match.
