refactor: Use override instead of virtual where possible (#4917)

src/widgets/listview/GenericItemDelegate.hpp

@@ -10,7 +10,7 @@ class SwitcherItemDelegate : public QStyledItemDelegate
 
 public:
     SwitcherItemDelegate(QObject *parent = nullptr);
-    ~SwitcherItemDelegate();
+    ~SwitcherItemDelegate() override;
 
     void paint(QPainter *painter, const QStyleOptionViewItem &option,
                const QModelIndex &index) const override;

src/widgets/listview/GenericListView.hpp

@@ -16,7 +16,7 @@ class GenericListView : public QListView
 public:
     GenericListView();
 
-    virtual void setModel(QAbstractItemModel *model) override;
+    void setModel(QAbstractItemModel *model) override;
     void setModel(GenericListModel *);
     void setInvokeActionOnTab(bool);
     bool eventFilter(QObject *watched, QEvent *event) override;