Clean up qtk.

src/app/widgetplugin.cpp

@@ -24,7 +24,7 @@ WidgetPlugin::WidgetPlugin(
     WidgetPlugin::Factory factory) :
     m_group(std::move(group)),
     m_className(std::move(class_name)), m_includeFile(std::move(include)),
-    m_factory(std::move(factory)), m_objectName(class_name) {}
+    m_factory(std::move(factory)), m_objectName(m_className) {}
 
 WidgetPlugin::WidgetPlugin(QObject * parent) : QObject(parent) {}