Update WinUI to build 2.6.2 (#1660)

src/Calculator/App.xaml.cs

@@ -440,10 +440,6 @@ namespace CalculatorApp
 
             mainPage.UnregisterEventHandlers();
 
-            // TODO, remove this workaround after Mica fix
-            // Workaround app crash caused by Mica in multi-view case.
-            Microsoft.UI.Xaml.Controls.BackdropMaterial.SetApplyToRootOrPageBackground(mainPage, false);
-
             await frameService.HandleViewRelease();
             await Task.Run(() =>
             {

src/Calculator/Calculator.csproj

@@ -788,7 +788,7 @@
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
       <Version>6.2.10</Version>
     </PackageReference>
-    <PackageReference Include="Microsoft.UI.Xaml" Version="2.6.1" />
+    <PackageReference Include="Microsoft.UI.Xaml" Version="2.6.2" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\CalcViewModel\CalcViewModel.vcxproj">

src/Calculator/Views/MainPage.xaml

@@ -102,6 +102,7 @@
                              Loaded="OnNavLoaded"
                              MenuItemsSource="{x:Bind CreateUIElementsForCategories(Model.Categories), Mode=OneWay}"
                              OpenPaneLength="{x:Bind NavigationViewOpenPaneLength(Model.IsAlwaysOnTop), Mode=OneWay}"
+                             PaneDisplayMode="LeftMinimal"
                              PaneClosed="OnNavPaneClosed"
                              PaneOpened="OnNavPaneOpened"
                              SelectionChanged="OnNavSelectionChanged"