Emulator freezes with quick save mapped on xInput gamepad

[Yankshuru]

As title says, mGBA (win64 version) 0.8.4.

I tried regular save state and quick save state, same issue for both.

The mapped button was L3/R3

Thanks for the support.

[endrift]

This was likely caused by #1889.

[endrift]

I was half right--that PR exposed the actual issue, but the fix was elsewhere.