Qt: Remove unused variable
Qt: Remove unused variable

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