GBA Savedata: Fix loading savestates with 512Mb Flash saves
GBA Savedata: Fix loading savestates with 512Mb Flash saves

Anty-Lemon/mgba,libretro/mgba,Iniquitatis/mgba,sergiobenrocha2/mgba,libretro/mgba,iracigt/mgba,fr500/mgba,Iniquitatis/mgba,Iniquitatis/mgba,Iniquitatis/mgba,Anty-Lemon/mgba,sergiobenrocha2/mgba,sergiobenrocha2/mgba,mgba-emu/mgba,jeremyherbert/mgba,jeremyherbert/mgba,libretro/mgba,mgba-emu/mgba,sergiobenrocha2/mgba,Anty-Lemon/mgba,fr500/mgba,mgba-emu/mgba,sergiobenrocha2/mgba,iracigt/mgba,libretro/mgba,iracigt/mgba,iracigt/mgba,fr500/mgba,Anty-Lemon/mgba,mgba-emu/mgba,jeremyherbert/mgba,fr500/mgba,jeremyherbert/mgba,libretro/mgba