clutter: Fix event axes array indices in axis broadcasts

Merged Quytelda Kahja requested to merge quytelda/mutter:fix_tablet_tilt into main

A clutter event's axes array is indexed by ClutterInputAxis. However, a few lines accidentally use ClutterInputAxisFlags as indices, reading incorrect values from elsewhere in memory. As a result, broadcasted axis values for the tilt, rotation, and wheel axes don't reflect actual event data.

Fixes: #1982 (closed)

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