[FIX] point_of_sale: anglosaxon prices werent correctly calcuated

Reproduce:
1. I create a product with fifo and real_time valuation (make sure the invoicing policy is 'delivered' and make it available in pos).
2. set the cost of the product to be 5.0 and sale price to be 10.0.
3. I update its inventory and set 5 items. -> total valuation of 25.
4. I change the cost of the product to 1.0.
5. I update again the quantity to 10, making the valuation of the product to 30.0.
6. I configure point of sale to allow invoicing.
7. Open a pos session then sell 7 items of the product (invoice the order).
8. Since the product is fifo, this means that the cost of goods sold is 5 * 5.0 + 2 * 1.0 = 27.0.
9. The correct expense account line should have balance of 27.0.
10. The correct output account line should have balance of -27.0

However, instead of 27.0 as stock valuation amount, the value in the
pos.order invoice is currently 7 * 2.0 = 14 -- and this is wrong. It is
not taking into account the value of the previous stock

Solution:
Missing refactoring from https://github.com/odoo/odoo/commit/14812f41710282f9923078f6764323086500ae85

closes odoo/odoo#35335

Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>

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