xwayland: Fix LeaveNotify for relative pointer

Since commit 20c78f38, we use the relative pointer for enter/leave events.

However, sprite_check_lost_focus() which verifies whether the pointer has left an Xwayland surface still explicitly check for the absolute pointer.

As a result, no LeaveNotify event is emitted anymore now when the pointer crosses from an Xwayland surface to a Wayland native one.

Make sure to check the last slave device against get_pointer_event() as well, not just the absolute pointer.

Signed-off-by: Olivier Fourdan ofourdan@redhat.com Fixes: 20c78f38 - xwayland: use get_pointer_device() for enter/leave handling too

CC: @romangg, @whot

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