Remove wrong reference to share project (#280)

Author: josesimoes

source/UnitTestLauncher/nanoFramework.UnitTestLauncher.nfproj

@@ -44,7 +44,6 @@
       <HintPath>..\..\packages\nanoFramework.CoreLibrary.1.15.5\lib\mscorlib.dll</HintPath>
     </Reference>
   </ItemGroup>
-  <Import Project="..\TestFrameworkShared\TestFrameworkShared.projitems" Label="Shared" />
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />
   <ProjectExtensions>
     <ProjectCapabilities>