toytoolkit: avoid unnecessary redraws when focus changes

Clients that need to be redrawn when the focus changes do that by
listening to focus_changed and scheduling a redraw.

This was causing unnecessary redraws in the clients, as could be
easily seen by changing focus on weston-flower.

Signed-off-by: Emilio Pozuelo Monfort <emilio.pozuelo@collabora.co.uk>

clients/window.c

@@ -3857,7 +3857,6 @@ handle_surface_focused_set(void *data, struct xdg_surface *xdg_surface)
 {
 	struct window *window = data;
 	window->focused = 1;
-	window_schedule_redraw(window);
 }
 
 static void
@@ -3865,7 +3864,6 @@ handle_surface_focused_unset(void *data, struct xdg_surface *xdg_surface)
 {
 	struct window *window = data;
 	window->focused = 0;
-	window_schedule_redraw(window);
 }
 
 static void