Small fix on samples

Author: azchohfi

CommunityToolkit.WinUI.SampleApp/SamplePages/AcrylicBrush/AcrylicBrushXaml.bind

@@ -20,11 +20,12 @@
               Grid.Column="2"
               Height="400">
         <Border.Background>
-          <brushes:AcrylicBrush BackgroundSource="@[Source:Enum:AcrylicBackgroundSource.Backdrop]"
+          <brushes:AcrylicBrush 
                                 TintColor="@[Tint:Brush:DarkCyan]"
                                 TintOpacity="@[TintMix:DoubleSlider:0.2:0.0-1.0]"
                                 BlurAmount="@[BlurAmount:DoubleSlider:12:0.0-32.0]"
                                 TextureUri="ms-appx:///Assets/BrushAssets/NoiseTexture.png"/>
+            <!-- BackgroundSource="@[Source:Enum:AcrylicBackgroundSource.Backdrop]" -->
         </Border.Background>
       </Border>
     </Grid>

CommunityToolkit.WinUI.SampleApp/SamplePages/Loading/LoadingCode.bind

@@ -63,10 +63,10 @@
 
     <controls:Loading x:Name="LoadingControl">
       <controls:Loading.Background>
-        <brushes:AcrylicBrush BackgroundSource="Backdrop"
-                              TintColor="Black"
+        <brushes:AcrylicBrush TintColor="Black"
                               TintOpacity="@[Opacity:DoubleSlider:0.4:0.0-1.0]"
                               BlurAmount="@[BlurAmount:DoubleSlider:8:0.0-24.0]"/>
+          <!-- BackgroundSource="Backdrop" -->
       </controls:Loading.Background>
       <ContentControl x:Name="LoadingContentControl" />
     </controls:Loading>