[FIX] point_of_sale: payment method journal in wrong currency
[FIX] point_of_sale: payment method journal in wrong currency

Steps to reproduce the bug:
- Install point_of_sale and account_accountant
- Create a company C in USD
- Create a cash journal CJ with no currency set
- Activate Multicurrency
- Create a pricelist P in EUR
- Create a sales journal SJ with currency = EUR
- Create pos.config in company C
- Assign SJ in the Sales Journal field
- Set P as default pricelist
- Set the cash journal CJ as payment method and save

Bug:

As CJ is implicitly in USD, it was wrong to set CJ as payment method in a pos.config
in EUR.

With courtesy of <jcb@odoo.com>

opw:2031883

closes odoo/odoo#34790

Signed-off-by: Simon Goffin (sig) <b3ed2cf313e7546085c3c50622143ff31e467d23@openerp.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo