Create a credit note for an amount between 0 and 1, confirm it.
In Accounting app, open Reporting -> Invoice Analysis
Switch to Pivot View
The credit note amount will be positive
This occur because in `insertThousandsSep` the number -0 is converted
to "0" (string), thus losing the sign before saving it
opw-2759964
closesodoo/odoo#84946
X-original-commit: c71d4c2349e623a4bcc49c2318fbbc9de08e0fa4
Signed-off-by: Grazioso Andrea (agr) <agr@odoo.com>