Remove local item group (#7412)

Remove local development item group accidentally added by #7110.

Author: martincostello

src/Servers/Kestrel/Core/test/Microsoft.AspNetCore.Server.Kestrel.Core.Tests.csproj

@@ -13,10 +13,6 @@
     <Content Include="$(KestrelSharedSourceRoot)test\TestCertificates\*.pfx" LinkBase="shared\TestCertificates" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Compile Remove="C:\Users\jukotali\code\aspnetcore\src\Servers\Kestrel\shared\test\HttpResponseWritingExtensions.cs" />
-  </ItemGroup>
-
   <ItemGroup>
     <Reference Include="Microsoft.AspNetCore.Http" />
     <Reference Include="Microsoft.AspNetCore.Server.Kestrel.Core" />