[Xwayland] Add PtrFeedback to the touch device

Olivier Fourdan requested to merge ofourdan/xserver:issue1137 into master

Trying to change the acceleration/threshold on Xwayland cannot work, and the corresponding handler xwl_pointer_control() is a no-op.

Yet, an X11 client trying to change those on the touch device may possibly cause a crash because the touch device in Xwayland doesn't set that.

Initialize the touch device's PtrFeedback to make sure that just cannot happen.

#1137 (closed)

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