desktop-shell: Make surface_move take a pointer instead of a seat

It doesn't actually need the seat and we have to validate that the seat
has a pointer before making the call, so it's safer just to pass
the validated pointer.

Reviewed-by: Jonas Ã…dahl <jadahl@gmail.com>
Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
1 file changed