[FIX] sale_timesheet: add onchange to set default value
[FIX] sale_timesheet: add onchange to set default value

When changing the type of a product to 'service' the
new service policy is empty by default, and should not
be !

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