Fix focus related damage

When you have an unfocused container (so one view is focused_inactive),
and you focus any other view in that container, the view with
focused_inactive was not damaged. This is because we damaged the
previous focus and new focus, but needed to damage the parent of the new
focus.

sway/input/seat.c

@@ -663,7 +663,7 @@ void seat_set_focus_warp(struct sway_seat *seat,
 		}
 
 		seat_send_focus(container, seat);
-		container_damage_whole(container);
+		container_damage_whole(container->parent);
 	}
 
 	// clean up unfocused empty workspace on new output