Also fix obvious bug in the initialisation of the
connectivity::odbc::OConnection::m_bClosed field.
Probably closes some kind of connection leak there.

Change-Id: I04579cf91bcd6d6c51c697d83971da4142743a82
Reviewed-on: https://gerrit.libreoffice.org/28932Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>