[FIX] account: Updating currency on Vendor bill

Steps to reproduce the bug:

- Enable Multi-Currencies and Multi-Companies
- Create a vendor bill
- Remove the default journal
- Set an other currencies

Bug:

A traceback was raised

opw:2350490

closes odoo/odoo#59544

X-original-commit: d9f8efcc
Signed-off-by: Simon Goffin (sig) <sig@openerp.com>
Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>