[FIX] point_of_sale: wrong price on receipt fix

Before this commit, if a user select option 'tax-Included Price' in pricing
from pos.config and sale product with a discount, it is first displaying
price without tax instead of the price including tax.

Task-2002464
Closes #33733

closes odoo/odoo#34259

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>