udev-builtin-input_id: don't label absolute mice as pointing sticks

The Getac UX10 tablet exposes a "CUST0000:00 0EEF:C002 Mouse" device
with BTN_LEFT/RIGHT and ABS_X/Y on the i2c bus. This causes the builtin
to incorrectly label it as pointing stick (all i2c mice are
tagged as ID_INPUT_POINTING_STICK, see 3d7ac1c6).

Fix this by adding a separate variable for absolute pointing
devices like the VMmouse USB mouse or this Getac tablet - this way we
skip the pointing stick check.

See https://gitlab.freedesktop.org/libinput/libinput/-/issues/743
for recordings.

(cherry picked from commit 8ac9ec4d)