[FIX] web, website: fix NavBar systrayItems getter patch

After OWL next was merged, an error popped up while patching the Navbar
systrayItems getter, coming from the Enterprise NavBar render. A setter
was added on the NavBar component to allow the patch.

task-2687506

addons/web/static/src/webclient/navbar/navbar.js

@@ -92,6 +92,10 @@ export class NavBar extends Component {
             .reverse();
     }
 
+    // This dummy setter is only here to prevent conflicts between the
+    // Enterprise NavBar extension and the Website NavBar patch.
+    set systrayItems(_) {}
+
     /**
      * Adapt will check the available width for the app sections to get displayed.
      * If not enough space is available, it will replace by a "more" menu

addons/website/static/src/components/navbar/navbar.js

@@ -35,5 +35,5 @@ patch(NavBar.prototype, 'website_navbar', {
                 .reverse();
         }
         return this._super();
-    }
+    },
 });