Gyrometer axis inverted on Switch

[RSDuck]

It took a short while for me to notice that I wasn't completely bad at playing Wario Ware Twisted, but that the Z-axis is inverted on Nintendo Switch 😄

Probably the same issue as #324

I only tested it on the Retroarch build, but it likely affects the standalone build too, since they use the same code for gyrometer input.

[endrift]

I swear I tested this...will try again soon. I always get this wrong.