Qt: Fix memory leak
Qt: Fix memory leak

Iniquitatis/mgba,Anty-Lemon/mgba,Iniquitatis/mgba,mgba-emu/mgba,mgba-emu/mgba,libretro/mgba,mgba-emu/mgba,libretro/mgba,Anty-Lemon/mgba,Iniquitatis/mgba,Iniquitatis/mgba,Anty-Lemon/mgba,Anty-Lemon/mgba,libretro/mgba,libretro/mgba,libretro/mgba,mgba-emu/mgba