DeliveryAdminWindow: Fix creation of new deliveries

Elwig/App.xaml.cs

@@ -218,7 +218,8 @@ namespace Elwig {
             MainDispatcher.Invoke(() => {
                 foreach (Window w in CurrentApp.Windows) {
                     if (w is not ContextWindow c) continue;
-                    MainDispatcher.BeginInvoke(c.HintContextChange);
+                    MainDispatcher.Invoke(c.HintContextChange);
+                    MainDispatcher.BeginInvoke(c.TryContextReload);
                 }
             });
         }