keyboard: Close keyboard immediately on Clutter.InputPanelState.OFF

This is already covered by a timeout to handle focus transitions between
windows at the Clutter.InputMethod implementation, we can react immediately
and avoid chaining up timeouts.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3162>

js/ui/keyboard.js

@@ -1644,7 +1644,7 @@ export const Keyboard = GObject.registerClass({
         if (enabled)
             this.open(Main.layoutManager.focusIndex);
         else
-            this.close();
+            this.close(true);
     }
 
     _setActiveLevel(activeLevel) {