[FIX] point_of_sale: Show price without discount in receipt

Current behavior:
When a discount is applied to a product, the receipt shows the price
with the discount applied as the base price.

Steps to reproduce:
- Open PoS
- Add a product to the order
- Apply a discount to the product with the numpad
- Validate the order
- Check the receipt, the base price of the product is the price with the
  discount applied.

(https://github.com/odoo/odoo/assets/32939472/eb0998a7-70a1-432a-8909-868d9307c999

)
The price in red should be 70$ (the price without the 5% discount)

opw-3463745

closes odoo/odoo#133377

Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>