Also changed the dialog's code a bit to work correctly with
the UI test too.

Change-Id: Idec85746f5ada979518d1fb0e09dc1c8e22ba7c1
Reviewed-on: https://gerrit.libreoffice.org/68967
Tested-by: Jenkins
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>