`mass_mailing_table_item` was charged with ensuring proper cloning and removing of table elements precisely because `mass_mailing` relied so heavily on them. Since it doesn't anymore, there is no need for that option. This removes it. task-2554899 X-original-commit: 386848568adb8e11f57e458cb7862cb3058b07c9 Part-of: odoo/odoo#77724