Remove Microsoft.Extensions.RazorViews.Sources

\n\nCommit migrated from dotnet/extensions@3f5df6d

Author: Nate McMaster

src/Shared/RazorViews/AttributeValue.cs

@@ -10,7 +10,6 @@
     <Compile Include="..\src\**\*.cs"
              Exclude="
               ..\src\BenchmarkRunner\**\*.cs;
-              ..\src\RazorViews\**\*.cs;
               ..\src\StackTrace\ExceptionDetails\**\*.cs;
               " />
     <EmbeddedResource Include="..\src\**\*.resx" />