[client] wayland: handle output scale changes

If the scale factor of an wl_output changes while the client is running,
the maximum scale factor is not updated. This may result in incorrect
scaling.

Therefore, when the scale factor is changed, we should generate a
resize event.

client/displayservers/Wayland/output.c

@@ -49,6 +49,7 @@ static void outputScaleHandler(void * opaque, struct wl_output * output, int32_t
 {
   struct WaylandOutput * node = opaque;
   node->scale = scale;
+  waylandWindowUpdateScale();
 }
 
 static const struct wl_output_listener outputListener = {