Current behavior: When the list of order line is too long in the split bill screen there was no scroll bar to see the last order lines. Steps to reproduce: - Open PoS restaurant - Create a new order - Add a lot of order lines - Click on the split bill button - The list of order lines is not scrollable opw-3676165 closes odoo/odoo#149800 Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>