Bugzilla Migration: Change bugs.freedesktop.org -> bugs.libreoffice.org

Change-Id: I12591e20d81023693a53d334526176085d5f964b
Reviewed-on: https://gerrit.libreoffice.org/6692
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>