Added `future_driver_id` in the 'Changed Driver' subtype. OPW-2242321 closes odoo/odoo#52150 X-original-commit: d2174b3223e9987ae05920c5c9de54688ee05eda Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com> Signed-off-by: Richard Mathot (rim) <rim@openerp.com>