Update Directory.Build.props

Author: aacebo

Libraries/Directory.Build.props

@@ -19,7 +19,7 @@
 
   <ItemGroup>
     <None Include=".\README.md" Pack="true" PackagePath="\" />
-    <None Include="$(RepoRoot)\Assets\icon.png" Pack="true" PackagePath="\" />
+    <None Include=".\..\..\Assets\icon.png" Pack="true" PackagePath="\" />
   </ItemGroup>
 
 </Project>