Setting download name: To let other product name can pass to $start

Because the product name may be others.

Change-Id: I2cd60fd029c7a75b8018b681303aa2883cd3dc97
Reviewed-on: https://gerrit.libreoffice.org/12074
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>