[FIX] sale: SO count
[FIX] sale: SO count

Apply e1767490e939233c050f796f4ae4f6db627d53c3 to SO count in order to
take into account all children, and not only direct children.

opw-1941335

closes odoo/odoo#31329
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo