Simplify thread marshal

Author: NeuralFault

StabilityMatrix.Avalonia/Services/NotificationService.cs

@@ -45,16 +45,13 @@ public void Initialize(
         };
     }
 
-   public void Show(INotification notification)
-{
-    // Must marshal to UI thread - WindowNotificationManager requires it
-    if (Dispatcher.UIThread.CheckAccess())
+    public void Show(INotification notification)
     {
-        notificationManager?.Show(notification);
+        // Must marshal to UI thread - WindowNotificationManager requires it
+        Dispatcher.UIThread.Invoke(() => notificationManager?.Show(notification));
     }
-    else
     {
-        Dispatcher.UIThread.Post(() => notificationManager?.Show(notification));
+        notificationManager?.Show(notification);
     }
 }