Retrieve the default value (if set) of a column during
QSqlDatabase::record() but not for QSqlQuery::record() as it's done for
the other drivers which support retrieving the default column value.
Fixes: QTBUG-122723
Change-Id: I92e052bfa6d88e019c0151fbcbc1483a65770c55
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>