fix Warning

qt6-after/qt6-migrated-legatus/Lts/Tools/SqlBrowser/AddModel.cpp

@@ -97,10 +97,10 @@ bool AddModel::setData(const QModelIndex &index, const QVariant &value, int role
 }
 
 
-QVariant::Type AddModel::getColumnType(const int column) const
+QMetaType::Type AddModel::getColumnType(const int column) const
 {
   if (column < 0 || column >= m_headerList.size())
-    return QVariant::Invalid;
+    return QMetaType::UnknownType;
   return m_headerList.at(column).second;
 }