Convert RID_SANE_DIALOG to .ui

Change-Id: I1f08493cdc18f4c0691a8436368432fe4e94dec3
Reviewed-on: https://gerrit.libreoffice.org/9696
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>