Make preprocessor check in wxTextCtrl test more clear

The condition guarding wxEVT_TEXT_URL test was changed to use
wxHAS_2CHAR_NEWLINES in 15c5125572 (Refactoring, 2021-08-07) but
shouldn't have been as this has nothing to do with the use of "\r\n"
under MSW.

No real changes.

tests/controls/textctrltest.cpp

@@ -444,7 +444,7 @@ void TextCtrlTestCase::ProcessEnter()
 
 void TextCtrlTestCase::Url()
 {
-#if wxUSE_UIACTIONSIMULATOR && wxHAS_2CHAR_NEWLINES
+#if wxUSE_UIACTIONSIMULATOR && defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
     // For some unfathomable reason, this test consistently fails when run in
     // AppVeyor CI environment, even though it passes locally, so skip it
     // there.