Minor clean-up for //build

Author: jeffstall

Samples/Islands/WpfCalculator/CalculatorDemo/MainWindow_Demo4.cs

@@ -16,35 +16,27 @@ private void CreateDrawingIslandMenuItem_Click(object sender, RoutedEventArgs e)
             var wpfIslandHost = new WpfIslandHost(_compositor);
             var drawingIsland = new DrawingIslandComponents.DrawingIsland(_compositor);
 
-            // After this, the WpfIslandHost will be live, and the DesktopChildSiteBridge will be available.
             DisplayAreaBorder.Child = wpfIslandHost;
-
             wpfIslandHost.DesktopChildSiteBridge.Connect(drawingIsland.Island);
         }
 
         private void CreateLottieIslandMenuItem_Click(object sender, RoutedEventArgs e)
         {
             var wpfIslandHost = new WpfIslandHost(_compositor);
-            _lottieContentIsland = LottieIslandScenario.CreateLottieIsland(_compositor);
+            var lottieContentIsland = LottieIslandScenario.CreateLottieIsland(_compositor);
 
-            // After this, the WpfIslandHost will be live, and the DesktopChildSiteBridge will be available.
             DisplayAreaBorder.Child = wpfIslandHost;
-
-            wpfIslandHost.DesktopChildSiteBridge.Connect(_lottieContentIsland.Island);
+            wpfIslandHost.DesktopChildSiteBridge.Connect(lottieContentIsland.Island);
         }
 
         private async void CreateSceneNodeIslandMenuItem_Click(object sender, RoutedEventArgs e)
         {
             var wpfIslandHost = new WpfIslandHost(_compositor);
             var helmetIsland = await HelmetScenario.CreateIsland(_compositor);
 
-            // After this, the WpfIslandHost will be live, and the DesktopChildSiteBridge will be available.
             DisplayAreaBorder.Child = wpfIslandHost;
-
             wpfIslandHost.DesktopChildSiteBridge.Connect(helmetIsland);
         }
-
-        LottieContentIsland _lottieContentIsland;
     }
 }