[FIX] sale_company_currency: Changes on sale_order_currency_rate

[dalonsofl]

Module

sale_company_currency

Describe the bug

The problem was the Total (company currency) field (amount_total_curr) was bad calculated as I explained in the PR. However, the field was not incorrect, the incorrect value was the currency_rate in sale_order_currency_rate that uses for amount_total_curr's calculation.

Because this reason, I have created a new PR https://github.com/OCA/sale-workflow/pull/3260 changing the calcultaion of currency_rate as it is in odoo base and explainning the problema more detailed.

Affected versions:

16.0