Fix network configurator memory leaking (#27346)

* Fix network configurator memory leaking

Doesn't dispose this window.

* Fix the other part

Content.Client/NetworkConfigurator/NetworkConfiguratorBoundUserInterface.cs

@@ -88,6 +88,7 @@ public sealed class NetworkConfiguratorBoundUserInterface : BoundUserInterface
         base.Dispose(disposing);
         if (!disposing) return;
 
+        _linkMenu?.Dispose();
         _listMenu?.Dispose();
         _configurationMenu?.Dispose();
     }