Revert "pointer: Repick after the focused surface is destroyed"

This reverts commit e496ed50d6.

This was incorrect. wl_surface_destructor actually does the full repick
-- doing it here is dangerous, because the destroy listeners actually
run *before* the destructor, not after, so the surface is still alive.

src/wayland/meta-wayland-pointer.c

@@ -96,7 +96,7 @@ pointer_handle_focus_surface_destroy (struct wl_listener *listener, void *data)
 {
   MetaWaylandPointer *pointer = wl_container_of (listener, pointer, focus_surface_listener);
 
-  meta_wayland_pointer_repick (pointer);
+  meta_wayland_pointer_set_focus (pointer, NULL);
 }
 
 static void