Fix OutputType=exe in OpenDelegate.csproj

I believe this was a pre-existing bug - previously, with the
special clause regarding SharedLibrary, the test just got silently
skipped because it was considered to be a shared library.

Thanks

Tomas

src/tests/CoreMangLib/system/delegate/VSD/OpenDelegate.csproj

@@ -1,5 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
+    <OutputType>exe</OutputType>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>