LR35902: Fix RET timing
LR35902: Fix RET timing

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