[FIX] pos_discount: get price based on total without tax

When you are applying a discount, the base amount is the one tax
included which is wrong as we'll apply the tax of the discount product
on it. So we are basing the discount computation on the total without
taxes and then apply the tax configured on the product.

It doesn't work with multiple taxes, but will be handled in future
developement in odoo.

closes odoo/odoo#36798

Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

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