[FIX] stock: To avoid singleton error
[FIX] stock: To avoid singleton error

Execute on a single record is used when calling the function
_update_line_quantity and avoid singleton error

Closes #23860
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo