js: Avoid Clutter.get_current_event() in Clutter.Actor event vfuncs

We sometimes obtained the current event through the general machinery
just so we could pass it along as a ClutterEvent instead of a specialized
subtype.

We now get that out of the box, so may avoid getting the current event
which is just a cast of the same current event we already have.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2872>

js/ui/modalDialog.js

@@ -111,8 +111,8 @@ export const ModalDialog = GObject.registerClass({
         this.notify('state');
     }
 
-    vfunc_key_press_event() {
-        if (global.focus_manager.navigate_from_event(Clutter.get_current_event()))
+    vfunc_key_press_event(event) {
+        if (global.focus_manager.navigate_from_event(event))
             return Clutter.EVENT_STOP;
 
         return Clutter.EVENT_PROPAGATE;