refactor(registry): add missing override specifier

Author: trollixx

src/libs/registry/listmodel.h

@@ -41,7 +41,7 @@ class ListModel final : public QAbstractItemModel
 public:
     ~ListModel() override;
 
-    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
 
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
     QModelIndex index(int row, int column, const QModelIndex &parent) const override;