core: Do not repick pointer while syncing wayland foci

Merged Carlos Garnacho requested to merge carlosg/mutter:wip/carlosg/no-repick-on-sync-focus into main

This is a remnant of unreliable pointer state after some of the event grabbing conditions (originally introduced for window dragging at commit 1b291131). Since the introduction of ClutterGrab and implicit grabs generating crossing events when the conditions change, this is not necessary.

Related: #2977 (closed)

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