Correct wrong error handler in wxDialUpManagerMSW code.

Forgot to set the success flag to false if thread creation failed.

See #15893.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75660 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/dialup.cpp

@@ -1149,6 +1149,8 @@ bool wxDialUpManagerMSW::EnableAutoCheckOnlineStatus(size_t nSeconds)
             wxLogLastError(wxT("CreateThread(RasStatusThread)"));
 
             CleanUpThreadData();
+
+            ok = false;
         }
     }