js: Account for promisified call() method

A promisified method expects the callback parameter to be either
a function (in which case the original method is called normally)
or omitted altogether (in which case a Promise is returned).

The call to open application details in Software does neither and
passes null instead, which will result in a warning (because no
function argument means a promise will be used, but not omitting
the parameter means we end up with too many arguments).

https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2551

js/ui/panel.js

@@ -99,7 +99,7 @@ class AppMenu extends PopupMenu.PopupMenu {
                 '/org/gnome/Software',
                 'org.gtk.Actions', 'Activate',
                 new GLib.Variant('(sava{sv})', ['details', [args], null]),
-                null, 0, -1, null, null);
+                null, 0, -1, null);
         });
 
         this.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());