REmove unused code

src/snippets/snippetsmodel.cpp

@@ -437,12 +437,3 @@ Qt::DropActions SnippetsModel::supportedDropActions() const
     return Qt::CopyAction | Qt::MoveAction;
 }
 
-QHash<int, QByteArray> SnippetsModel::roleNames() const
-{
-    static QHash<int, QByteArray> names;
-    if (names.isEmpty()) {
-        names.insert(IsGroupRole, QByteArrayLiteral("isSnippetGroup"));
-    }
-
-    return names;
-}

src/snippets/snippetsmodel.h

@@ -61,7 +61,6 @@ public:
     bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override;
 
     Qt::DropActions supportedDropActions() const override;
-    QHash<int, QByteArray> roleNames() const override;
 
 protected:
     bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex()) override;