js: Update Meta.KeyHandlerFunc arguments

The Meta keybinding API now exposes the Clutter event to GJS, which was
previously hidden due to it being a gpointer. Since this moves the
binding argument one argument to the right on the GJS side, any code
that was using the binding argument needs to be updated.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3502>

js/ui/status/keyboard.js

@@ -426,7 +426,7 @@ export class InputSourceManager extends Signals.EventEmitter {
         return true;
     }
 
-    _switchInputSource(display, window, binding) {
+    _switchInputSource(display, window, event, binding) {
         if (this._mruSources.length < 2)
             return;