Swap out Sdk references to UwpMetaPackage based on PR feedback

Matches what we do for Microsoft.Toolkit.Uwp now.

Microsoft.Toolkit.Uwp.UI.Media/Microsoft.Toolkit.Uwp.UI.Media.csproj

@@ -19,10 +19,7 @@
     </Description>
     <PackageTags>UWP Toolkit Windows UI XAML brushes blur</PackageTags>
     
-    <UseWindowsDesktopSdk>true</UseWindowsDesktopSdk>
-    
-    <!-- For StatusBar -->
-    <UseWindowsMobileSdk>true</UseWindowsMobileSdk>
+    <UseUwpMetaPackage>true</UseUwpMetaPackage>
   </PropertyGroup>
 
   <ItemGroup>