[FIX] uom: rename ratio field
[FIX] uom: rename ratio field

The ratio field in the UoM form view has 2 different labels depending
on the type (bigger or smaller). This commit put the same label 'ratio'
for two cases.

Task :1859328

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