for sync gtk dialogs too

Change-Id: Iad40c539a663504d72f372a0d3b4427a23e717c4
Reviewed-on: https://gerrit.libreoffice.org/72626
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>