[FIX] point_of_sale: mandatory picking type
[FIX] point_of_sale: mandatory picking type

Make the picking type mandatory, otherwise any picking will be created
without one, which will cause stock issues.

opw-1873326

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo