Made fuctions synchronous that were no longer using await

Author: Rosuavio

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/ViewportBehavior/ViewportBehaviorPage.xaml.cs

@@ -67,7 +67,7 @@ private void ClearLogsButton_Click(object sender, RoutedEventArgs e)
             _logs.Clear();
         }
 
-        private async void EffectElementHost_EnteredViewport(object sender, EventArgs e)
+        private void EffectElementHost_EnteredViewport(object sender, EventArgs e)
         {
             AddLog("Entered viewport");
 
@@ -81,7 +81,7 @@ private void EffectElementHost_EnteringViewport(object sender, EventArgs e)
             _effectElement.Source = new BitmapImage(new Uri("ms-appx:///Assets/ToolkitLogo.png"));
         }
 
-        private async void EffectElementHost_ExitedViewport(object sender, EventArgs e)
+        private void EffectElementHost_ExitedViewport(object sender, EventArgs e)
         {
             AddLog("Exited viewport");