[FIX]purchase_stock,stock_account:partner on aml

The aim of this commit is to set partner on anglosaxon
aml in order to help our client in their stock
reconciliation process in case it hasn't been done automatically.

Before this commit:
anglosaxon line were created without partner

After this commit:
A partner is set when anglosaxon line are created

closes odoo/odoo#84520

Ticket: 2692308
Community-pr: https://github.com/odoo/odoo/pull/84468


X-original-commit: abfe37fc
Signed-off-by: William André (wan) <wan@odoo.com>