Added missing DefinedConstants import

Author: Arlodotexe

ProjectHeads/SingleComponent/Wasdk/ProjectTemplate.Wasdk.csproj

@@ -14,6 +14,8 @@
   <Import Project="$(ToolingDirectory)\MultiTarget\AvailableTargetFrameworks.props" />
   <Import Project="$(ToolingDirectory)\MultiTarget\EnabledTargetFrameworks.props" />
 
+  <Import Project="$(ToolingDirectory)\MultiTarget\DefinedConstants.props" />
+  
   <Import Project="$(ToolingDirectory)\ProjectHeads\App.Head.WinAppSdk.props" />
 
   <ItemGroup>