grab: Expect motion events before touch-emulated button presses

The current server code for event is clear in that emulated motion events are expected before emulated button events. Update tests to match.

Note that in the case of pointer grabs, the first motion event is not reported because by that time the press event has not happened yet and the pointer grab is not yet active.

cc @whot

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• 9938fbb2...e36311a6 - 6 commits from branch xorg/test:master
• 687d4517 - grab: Expect motion events before touch-emulated button presses

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