In this commit, we add the tracking_number of an order as a searchable field in the ticket_screen. This is useful when using pos_self_order for example. If a mobile is made with service at table and pay at cashier after each order, the cashier can search the order by its tracking_number in the history of orders. closes odoo/odoo#139187 Related: odoo/enterprise#49200 Signed-off-by: Vlad Stroia (vlst) <vlst@odoo.com>