backend: move the cursor render update on screen changes here

https://bugzilla.gnome.org/show_bug.cgi?id=788860

src/backends/meta-backend.c

@@ -196,6 +196,8 @@ meta_backend_monitors_changed (MetaBackend *backend)
           priv->is_pointer_position_initialized = TRUE;
         }
     }
+
+  meta_cursor_renderer_force_update (priv->cursor_renderer);
 }
 
 void