Fix invalid `IsLoaded` check
Fix invalid `IsLoaded` check

Would fail when `availableMods` would be changed from a different thread
while the columns aren't loaded.

ppy/osu,peppy/osu,NeoAdonis/osu,peppy/osu,ppy/osu,ppy/osu,NeoAdonis/osu,NeoAdonis/osu,peppy/osu