Fixed build issue for older Qt versions

Author: githubuser0xFFFF

src/DockComponentsFactory.cpp

@@ -46,7 +46,7 @@ CDockAreaTitleBar* CDockComponentsFactory::createDockAreaTitleBar(CDockAreaWidge
 //============================================================================
 const CDockComponentsFactory* CDockComponentsFactory::factory()
 {
-	return DefaultFactory.get();
+	return DefaultFactory.data();
 }