[FIX] account: typo for return default_account_id value

closes odoo/odoo#64739

X-original-commit: 5495808c6504b3c8a026be92e53bb62326a1164f
Signed-off-by: Laurent Smet <smetl@users.noreply.github.com>

addons/account/models/account_journal.py

@@ -678,13 +678,14 @@ class AccountJournal(models.Model):
         a logic based on accounts.
 
         :param domain:  An additional domain to be applied on the account.move.line model.
-        :return:        The balance expressed in the journal's currency.
+        :return:        Tuple having balance expressed in journal's currency
+                        along with the total number of move lines having the same account as of the journal's default account.
         '''
         self.ensure_one()
         self.env['account.move.line'].check_access_rights('read')
 
         if not self.default_account_id:
-            return 0.0
+            return 0.0, 0
 
         domain = (domain or []) + [
             ('account_id', 'in', tuple(self.default_account_id.ids)),