Add override keywords.

editor/editor_properties_array_dict.h

@@ -118,7 +118,7 @@ protected:
 
 public:
 	void setup(Variant::Type p_array_type, const String &p_hint_string = "");
-	virtual void update_property();
+	virtual void update_property() override;
 	EditorPropertyArray();
 };
 
@@ -152,7 +152,7 @@ protected:
 	void _notification(int p_what);
 
 public:
-	virtual void update_property();
+	virtual void update_property() override;
 	EditorPropertyDictionary();
 };