Remove redundent reference from FCS TestProj (#8138)

Author: KevinRansom

fcs/FSharp.Compiler.Service.Tests/FSharp.Compiler.Service.Tests.fsproj

@@ -101,6 +101,5 @@
     <Reference Include="UIAutomationTypes" />
     <ProjectReference Include="CSharp_Analysis\CSharp_Analysis.csproj" />
     <ProjectReference Include="..\FSharp.Compiler.Service.ProjectCracker\FSharp.Compiler.Service.ProjectCracker.fsproj" />
-    <ProjectReference Include="$(FSharpSourcesRoot)\fsharp\FSharp.Compiler.Interactive.Settings\FSharp.Compiler.Interactive.Settings.fsproj" />
   </ItemGroup>
 </Project>