Fixed an error in the Effects/Fade sample page

Microsoft.Toolkit.Uwp.SampleApp/SamplePages/Animations/Effects/FadeBehaviorXaml.bind

@@ -6,7 +6,7 @@
     xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
     xmlns:interactions="using:Microsoft.Xaml.Interactions.Core"
     xmlns:ani="using:Microsoft.Toolkit.Uwp.UI.Animations"
-    xmlns:behaviors="using:Microsoft.Toolkit.Uwp.UI.Behaviors.Animations"
+    xmlns:behaviors="using:Microsoft.Toolkit.Uwp.UI.Behaviors"
     xmlns:core="using:Microsoft.Xaml.Interactions.Core"
     mc:Ignorable="d">