Fix of action leak in CDockWidget, that apears when deleting DockWidget after tab closing

Author: jakerdy

src/DockWidget.cpp

@@ -214,7 +214,7 @@ CDockWidget::CDockWidget(const QString &title, QWidget *parent) :
 	setObjectName(title);
 
 	d->TabWidget = new CDockWidgetTab(this);
-    d->ToggleViewAction = new QAction(title, nullptr);
+    d->ToggleViewAction = new QAction(title, this);
 	d->ToggleViewAction->setCheckable(true);
 	connect(d->ToggleViewAction, SIGNAL(triggered(bool)), this,
 		SLOT(toggleView(bool)));