fix: use WithAppName instead of WithPackId for VelopackApp

src/RgbLedStripController/App.xaml.cs

@@ -9,7 +9,7 @@ public partial class App : System.Windows.Application
     public static void Main(string[] args)
     {
         VelopackApp.Build()
-            .WithPackId("Fristy.RgbLedStripController")
+            .WithAppName("Fristy.RgbLedStripController")
             .Run();
 
         var app = new App();