[FIX] product: bigger ratio
[FIX] product: bigger ratio

- Create a new unit of measure with 'Bigger than the reference Unit of
  Measure'
- Save
- Edit and change the ratio ==> the ratio is set back to its value

opw-695507

dfang/odoo,ygol/odoo,dfang/odoo,dfang/odoo,hip-odoo/odoo,hip-odoo/odoo,hip-odoo/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,dfang/odoo,ygol/odoo,ygol/odoo