modernize: use override

src/dialogs/ReadReceipts.h

@@ -22,7 +22,7 @@ public:
                     const QString &room_id);
 
 protected:
-        void paintEvent(QPaintEvent *);
+        void paintEvent(QPaintEvent *) override;
 
 private:
         QString dateFormat(const QDateTime &then) const;

src/dialogs/RoomSettings.h

@@ -35,7 +35,7 @@ signals:
         void clicked();
 
 protected:
-        bool eventFilter(QObject *obj, QEvent *event)
+        bool eventFilter(QObject *obj, QEvent *event) override
         {
                 if (event->type() == QEvent::MouseButtonRelease) {
                         emit clicked();