[FIX] product_visible_discount: recursive show discount

If a pricelist PL1 set with the discount policy
`Show discount in the sale order` was based on another
pricelist PL2 with the same discount policy,
the discount applied by the second pricelist PL2
was set directly in the price, rather to be displayed
as a discount.

e.g.
PL 1: 10% on all products, show discount
PL 2: 15% on all prices of the PL1 pricelist, show discount

The discount displayed on the sales order should be
100 − (100 × (1−0,15) × (1−0,10)) = 23.5%

And the unit price of the product must remain the initial
price of the product, not the discounted price.

opw-709708

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