BUG: Fixes overrides a destructor but is not marked 'override' (#836)

- If compiling with flag [-Werror,-Winconsistent-missing-destructor-override]

Author: imikejackson

src/DockAreaTitleBar.h

@@ -176,7 +176,7 @@ public Q_SLOTS:
 	/**
 	 * Virtual Destructor
 	 */
-	virtual ~CDockAreaTitleBar();
+	~CDockAreaTitleBar() override;
 
 	/**
 	 * Returns the pointer to the tabBar()

src/DockWidgetTab.h

@@ -91,7 +91,7 @@ private Q_SLOTS:
 	/**
 	 * Virtual Destructor
 	 */
-	virtual ~CDockWidgetTab();
+	~CDockWidgetTab() override;
 
 	/**
 	 * Returns true, if this is the active tab