Added winstidy to test stub

tests/ui/stub_ui.c

@@ -458,6 +458,7 @@ void cons_occupants_setting(void) {}
 void cons_roster_setting(void) {}
 void cons_presence_setting(void) {}
 void cons_wrap_setting(void) {}
+void cons_winstidy_setting(void) {}
 void cons_time_setting(void) {}
 void cons_mouse_setting(void) {}
 void cons_statuses_setting(void) {}