[FIX] account: bank statement currency

If there is no currency set on the journal,
the fallback currency must be the currency
of the journal company, not the currency
of the user company.

This would mean that when you change of company,
with another currency set,
the bank statement change of currency, this is non-sense.

opw-670187

addons/account/models/account_bank_statement.py

@@ -86,7 +86,7 @@ class AccountBankStatement(models.Model):
     @api.one
     @api.depends('journal_id')
     def _compute_currency(self):
-        self.currency_id = self.journal_id.currency_id or self.env.user.company_id.currency_id
+        self.currency_id = self.journal_id.currency_id or self.company_id.currency_id
 
     @api.one
     @api.depends('line_ids.journal_entry_ids')