Enabled ClickFocus for CDockWidget to support focussing in case the content does not support it

Renamed FocusStyling to FocusHighlighting

examples/deleteonclose/main.cpp

@@ -10,7 +10,7 @@ int main(int argc, char *argv[])
     QApplication a(argc, argv);
     QMainWindow w;
 
-    ads::CDockManager::setConfigFlag(ads::CDockManager::FocusStyling, true);
+    ads::CDockManager::setConfigFlag(ads::CDockManager::FocusHighlighting, true);
     auto dockManager = new ads::CDockManager(&w);
 
     QAction *action = new QAction("New Delete On Close", &w);