The parent is always the ScDBCollection that contains the
ScDBCollection::NamedDBs container, not the one the
ScDBCollection::NamedDBs was copy-constructed from.

Change-Id: Ia409347f3aeb9ad7a5e68da7af727adfac98d6a2
Reviewed-on: https://gerrit.libreoffice.org/60833Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins
(cherry picked from commit 7ea5d339)
Reviewed-on: https://gerrit.libreoffice.org/60842Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
(cherry picked from commit 8755c986)