Remove duplicate PackageReferences.

Author: bgrainger

tests/SideBySide/SideBySide.csproj

@@ -26,7 +26,6 @@
     <PackageReference Include="xunit" Version="2.3.0-beta5-build3769" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0-beta5-build3769" />
     <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.0-beta5-build3769" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0-beta5-build3769" />
     <!--app packages-->
     <PackageReference Include="Dapper" Version="1.50.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="1.1.1" />
@@ -38,7 +37,6 @@
   </ItemGroup>
 
   <ItemGroup Condition=" '$(Configuration)' == 'Baseline' ">
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
     <PackageReference Include="MySql.Data" Version="6.9.9" />
   </ItemGroup>