[FIX] stock: uom field on production lot not readonly
[FIX] stock: uom field on production lot not readonly

Because the uom field on production lot is a related field of
product.prodcut, we shouldn't change the uom of a product through the
production lot formé

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