animation: Schedule a repaint only on the outputs the surface is in

The function weston_surface_animation_frame() would schedule a repaint
on all outputs, as weston_surface_schedule_repaint() didn't exist when
it was implemented.

src/animation.c

@@ -154,7 +154,7 @@ weston_surface_animation_frame(struct weston_animation *base,
 		animation->frame(animation);
 
 	animation->surface->geometry.dirty = 1;
-	weston_compositor_schedule_repaint(animation->surface->compositor);
+	weston_surface_schedule_repaint(animation->surface);
 }
 
 static struct weston_surface_animation *