xcb: don't compress tablet motion events

7edd10e6

 added this compression feature, but it's not a good idea for
drawing-tablet applications, because smooth drawing depends on receiving
every movement of the stylus.

Also show the device ID in qt.qpa.input.devices category logging.

[ChangeLog][X11] The new X event compression feature that was added in
5.6.0 no longer applies to motion events from drawing tablets.

Task-number: QTBUG-44964
Change-Id: Icd2ca8ca77d8f80c2f39160c74208db10e382501
Reviewed-by: Gatis Paeglis <gatis.paeglis@theqtcompany.com>