QSqlTableModel: restore use of virtual setData() in setRecord()

QSqlTableModel: restore use of virtual setData() in setRecord()

setRecord() should use setData() as intended so that reimplementations
of setData() in subclasses will be respected.

Commit 11bd543d901f67f79db3f5b5dfaa626c6e8faa45 failed to consider this.

Test added which should prevent this mistake being repeated.

Change-Id: Ia2d930cd42b5a27521bb389edb1b07fb1bf0fa36
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Mark Brand <mabrand@mabrand.nl>