[FIX] point_of_sale: correctly set lot_id on refund orders

Current behavior:
When refunding an order, the lot_id of the original order was not set
on the refund order.

Steps to reproduce:
- Create a product with tracking by lot
- Open the POS and add the product to the order
- Set a lot on the product
- Pay the order
- Refund the order
- Check the lot on the refund order, there is no lot set

opw-3485740

closes odoo/odoo#135056

Signed-off-by: Robin Heinz (rhe) <rhe@odoo.com>