Remove duplicate packageversion

Author: carlossanlop

src/Compatibility/Directory.Packages.props

@@ -6,7 +6,6 @@
     <!-- We pin the code analysis version when not in source build as we need to support running on older
          SDKs when the OOB package is used. -->
     <PackageVersion Update="Microsoft.CodeAnalysis.CSharp" Version="4.4.0" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.Workspaces.Common" Version="$(MicrosoftCodeAnalysisWorkspacesCommon)" />
   </ItemGroup>
 
   <ItemGroup>