Now the dialog for selecting row/column group works fine

Change-Id: I88660e8f49cf41ae45926a1d7299b1370bf54b93
Reviewed-on: https://gerrit.libreoffice.org/49206Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Marco Cecchetti <mrcekets@gmail.com>
(cherry picked from commit 915ed578)