GBA Serialize: Fix using the wrong storage for biosStall
GBA Serialize: Fix using the wrong storage for biosStall

mgba-emu/mgba,libretro/mgba,mgba-emu/mgba,mgba-emu/mgba,libretro/mgba,Iniquitatis/mgba,libretro/mgba,libretro/mgba,mgba-emu/mgba,libretro/mgba,Iniquitatis/mgba,Iniquitatis/mgba,Iniquitatis/mgba