C#: Cleanup test options files.

Author: michaelnebel

csharp/ql/test/library-tests/asp/basic/Test.cs

@@ -1,5 +1,5 @@
 // semmle-extractor-options: /nostdlib /noconfig
-// semmle-extractor-options: --load-sources-from-project:${testdir}/../../../resources/stubs/_frameworks/Microsoft.AspNetCore.App/Microsoft.AspNetCore.App.csproj
+// semmle-extractor-options: --load-sources-from-project:${testdir}/../../../resources/stubs/_frameworks/Microsoft.NETCore.App/Microsoft.NETCore.App.csproj
 // semmle-extractor-options: ${testdir}/../../../resources/stubs/System.Web.cs
 
 using System;