GB: Fix DMG palettes again
GB: Fix DMG palettes again

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