GB: Fix and rename palettes
GB: Fix and rename palettes

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