FIXED Mayflash GCN Adapter in PC mode v1.1

This layout was made and tested with the specific adapter model that says "GameCube Controller Adapter for Wii U/PC/Switch" on top with no Mayflash logo visible. Other adapter models in PC mode may not work as expected. Stick deadzones adjusted + trigger sensitivities raised & hopefully thresholds and response curves are the right settings to stop bad inputs. If your L/R buttons still behave unexpectedly, either this layout still needs adjustments, or there's an issue with the adapter itself.