[FIX] hr_payroll_account: no company on payroll

When no company is set on the payslip, journal entries of zero are
generated.

This is because `currency` is empty, therefore `currency.round()` rounds
all amounts to zero.

We fall back on the company of the journal, since the latter is
mandatory.

opw-2054781

closes odoo/odoo#35859

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/hr_payroll_account/models/hr_payroll_account.py

@@ -60,7 +60,7 @@ class HrPayslip(models.Model):
             debit_sum = 0.0
             credit_sum = 0.0
             date = slip.date or slip.date_to
-            currency = slip.company_id.currency_id
+            currency = slip.company_id.currency_id or slip.journal_id.company_id.currency_id
 
             name = _('Payslip of %s') % (slip.employee_id.name)
             move_dict = {