This commit fixes a regression introduced by c44fa5bb
The evdev backend currently uses high_res_hwheel to select the
normalization denominator for both horizontal and vertical wheel
events.
This causes devices which advertise REL_WHEEL_HI_RES but not
REL_HWHEEL_HI_RES to report vertical wheel movement 120 times
larger than intended.
Use the corresponding high-resolution capability independently for
each axis, restoring the behavior before c44fa5bb.
b640b804a8