Fix xunit.runner.json inclusion

Author: ViktorHofer

test/Directory.Build.props

@@ -1,10 +1,9 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the MIT license. See License.txt in the project root for full license information. -->
 <Project>
 
   <PropertyGroup>
-    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
     <DefaultItemExcludes>$(DefaultItemExcludes);**/*.tmp</DefaultItemExcludes>
+    <XUnitDesktopSettingsFile>$(MSBuildThisFileDirectory)xunit.runner.json</XUnitDesktopSettingsFile>
+    <XUnitCoreSettingsFile>$(MSBuildThisFileDirectory)xunit.runner.json</XUnitCoreSettingsFile>
   </PropertyGroup>
 
   <Import Project="..\Directory.Build.props" />
@@ -38,7 +37,4 @@
     <Using Include="Xunit.Abstractions" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Content Include="$(MSBuildThisFileDirectory)xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
-  </ItemGroup>
 </Project>