[FIX] point_of_sale: round unit_price
[FIX] point_of_sale: round unit_price

- Set the product price decimals to 5
- Create a product costing 0.32
- Create a pricelist with 20 % discount when quantity is > 100
- Set a default fiscal position on the POS
- Lauch a POS session
- Add 500 units of the product

The unit price is rounded to 0.26, while it should be 0.256.

This is due to the call to `compute_all`, which will round to the
currency precision.

opw-1816997

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