[Test] Fix test for xcode 15 after apple changed back the behaviour.

tests/monotouch-test/ObjCRuntime/CategoryTest.cs

@@ -112,7 +112,9 @@ namespace MonoTouchFixtures {
 					vc.View.BackgroundColor = UIColor.Green;
 				};
 				AppDelegate.PresentModalViewController (nc, 0.5);
-				if (TestRuntime.CheckXcodeVersion (14, 0)) {
+				if (TestRuntime.CheckXcodeVersion (15, 0)) {
+					Assert.That (category_invoked);
+				} else if (TestRuntime.CheckXcodeVersion (14, 0)) {
 					// The 'shouldAutorotate' selector isn't called anymore in iOS 16+ (this is documented in Xcode 14's release notes)
 					Assert.That (!category_invoked);
 				} else {