[System.Runtime.Remoting] Use NotWorking category for test instead of…

… Ignore attribute

The TestFixtureSetUp would sometimes fail in CI, but none of the tests in this class are
actually run since they are all either [Category("NotWorking")] or [Ignore].

Moving the one test from Ignore to NotWorking category allows NUnit to recognize there
are no tests to run and skips the unnecessary TestFixtureSetUp completely.

mcs/class/System.Runtime.Remoting/Test/HttpServerChannelTests.cs

@@ -94,7 +94,7 @@ public ParseURLTestCase (string s0, string s1, string s2)
 		};
 
 		[Test] // HttpChannel.Parse ()
-		[Ignore ("Fails on MS")]
+		[Category ("NotWorking")] // Fails on MS
 		public void ParseURL ()
 		{
 			HttpChannel channel;