C#: Update test references to use .NET Core, and change relative directory of moved test file.

Author: calumgrant

csharp/ql/test/query-tests/Security Features/CWE-022/TaintedPath/TaintedPath.cs

@@ -1,4 +1,4 @@
-// semmle-extractor-options: /r:System.IO.FileSystem.dll /r:System.Runtime.Extensions.dll /r:System.Collections.Specialized.dll ${testdir}/../../../resources/stubs/System.Web.cs
+// semmle-extractor-options: /r:System.IO.FileSystem.dll /r:System.Runtime.Extensions.dll /r:System.Collections.Specialized.dll ${testdir}/../../../../resources/stubs/System.Web.cs
 
 using System;
 using System.IO;

csharp/ql/test/query-tests/Security Features/CWE-022/ZipSlip/ZipSlip.cs

@@ -1,4 +1,4 @@
-// semmle-extractor-options: /nostdlib /noconfig /r:${env.windir}\Microsoft.NET\Framework64\v4.0.30319\mscorlib.dll /r:${env.windir}\Microsoft.NET\Framework64\v4.0.30319\System.dll /r:${env.windir}\Microsoft.NET\Framework64\v4.0.30319\System.IO.Compression.dll /r:${env.windir}\Microsoft.NET\Framework64\v4.0.30319\System.IO.Compression.FileSystem.dll
+// semmle-extractor-options: /r:System.IO.Compression.dll /r:System.IO.Compression.FileSystem.dll /r:System.IO.Compression.ZipFile.dll /r:System.IO.FileSystem.dll
 using System;
 using System.IO;
 using System.IO.Compression;