On macOS, the tablet pen Y tilt behavior is inverted; an increase in the
tilt value corresponds to tilting the device away from the user. Account
for this difference by negating the Y tilt axis in the Cocoa pen tablet
handling code.
Refs:
* 0f128fd7c5/src/plugins/platforms/cocoa/qnsview_tablet.mm (L63)
* https://source.chromium.org/chromium/chromium/src/+/main:components/input/web_input_event_builders_mac.mm;drc=0af5ffa1e4cc4cc4f818725f8fee93ec57855e4b;l=421
Pull Request: https://projects.blender.org/blender/blender/pulls/133932