[FIX] spreadsheet_account: get balance from other companies

Steps to reproduce:

- use ODOO.BALANCE("1",,1) (make sure it returns some value)
- switch to another company (company 1 should not be active)
=> the balance doesn't appear even though the company_id is provided
   and set to 1

Issue introduced with a707f834

closes odoo/odoo#183316

Task: 4223319
X-original-commit: 7250d41e
Signed-off-by: Rémi Rahir (rar) <rar@odoo.com>