windowMenu: Use NONE ornament by default

We now hide ornaments by default. As some of the items in the
window menu can be checked, that means that they will now shift
horizontally, and no longer align with other menu items when
checked.

That's quite bad, and as the items in question don't form a
distinctive group/section, adding back the spacing only to
those two items would still look fairly awkward.

So revert back to the previous behavior for this particular menu,
and default to the NONE ornament.

Closes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/6962

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2926>

js/ui/windowMenu.js

@@ -211,6 +211,12 @@ export class WindowMenu extends PopupMenu.PopupMenu {
         if (!window.can_close())
             item.setSensitive(false);
     }
+
+    addAction(label, callback) {
+        const item = super.addAction(label, callback);
+        item.setOrnament(PopupMenu.Ornament.NONE);
+        return item;
+    }
 }
 
 export class WindowMenuManager {