Fix #5768 (#6063)

Author: crramirez

build/NuSpecs/MUXControls-Nuget-Common.targets

@@ -24,7 +24,7 @@
   <ItemGroup>
     <XamlWinmd Include="$(MSBuildThisFileDirectory)..\lib\uap10.0\Microsoft.UI.Xaml.winmd">
       <SkipHarvestingWinmdRegistration Condition="'$(MicrosoftUIXamlAppxVersion)' != ''">true</SkipHarvestingWinmdRegistration>
-      <TargetPath>$(WinMetadataDir)\Microsoft.UI.Xaml.winmd</TargetPath>
+      <TargetPath>Microsoft.UI.Xaml.winmd</TargetPath>
       <OutputGroup>CustomOutputGroupForPackaging</OutputGroup>
       <ProjectName>$(ProjectName)</ProjectName>
       <Implementation Condition="'$(MicrosoftUIXamlAppxVersion)' == ''">Microsoft.UI.Xaml.dll</Implementation>