Lift canceled touch inputs

Merged Dorian Stoll requested to merge StollD/xf86-input-libinput:bugfix/handle-cancel into master

If a touch input gets turned into a palm (by setting ABS_MT_TOOL_TYPE to MT_TOOL_PALM), libinput will emit a cancel event instead of the normal up event. The xorg wrapper needs to be able to handle a canceled touch and lift it, otherwise these inputs will never get lifted and will stick around forever.

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