[FIX] account: label for internal transfer

Create two differnt journals for two different bank accounts (A, B).
Create an Internal Transfer in bank A to send money, then reconcile.
Create an Internal Transfer in bank B to receive money, then try to
reconcile

Internal transfers are labeled 'Customer Reimbursement' and 'Customer
Payment' even if no external partner is involved in the process,

opw-2423161

closes odoo/odoo#64258

X-original-commit: 4fcacfac
Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>