[FIX] account: autoreconciliation multicurrency rounding

Have the company currency USD
Enable multicurrency and activate EUR with rate 11.2674
Create an invoice in EUR (i.e 100€)
Create a Bank Journal in EUR:
Have the invoice matching reconciliation model set to autovalidate
Create a bank statement (eur) matching the invoice
Click Post > Reconcile
Statement and Invoice will be automatically reconciled
Check the reconciled entry

Issue: Amount currency of the bank statement move line will be 100.05
This does not occur when manually reconciling and it's due to the high
exchange rate.
When converting the amount of the statement line (8.88) to company currency,
result will be incorrect (100.05)

opw-3196003

closes odoo/odoo#115437

X-original-commit: eef0deb5
Signed-off-by: Laurent Smet <las@odoo.com>
Signed-off-by: Grazioso Andrea (agr) <agr@odoo.com>
Co-authored-by: Laurent Smet <las@odoo.com>