Update WinAppSdk.props to conditionally reference packages based on HasWinUI

Author: Arlodotexe

MultiTarget/PackageReferences/WinAppSdk.props

@@ -1,10 +1,10 @@
 <Project>
   <ItemGroup>
-    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.6.240829007" />
-    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />
-    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.2792.45" PrivateAssets="all" />
+    <PackageReference Condition="'$(HasWinUI)' == 'true'" Include="Microsoft.WindowsAppSDK" Version="1.6.240829007" />
+    <PackageReference Condition="'$(HasWinUI)' == 'true'" Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.756" />
+    <PackageReference Condition="'$(HasWinUI)' == 'true'" Include="Microsoft.Web.WebView2" Version="1.0.2792.45" PrivateAssets="all" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Windows.CsWinRT" Version="2.1.1" />
+    <PackageReference Condition="'$(HasWinUI)' == 'true'" Include="Microsoft.Windows.CsWinRT" Version="2.1.1" />
   </ItemGroup>
 </Project>