and pass in parent window for dialog

Change-Id: Ibe9f576a74dfbbee3e568c8d3454440700cb0405
Reviewed-on: https://gerrit.libreoffice.org/54328Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>