[FIX] point_of_sale: compute the tax based on the rounded price

Before this, we would compute taxes based on quantity * price. In
account.tax (used by the POS backend) however taxes are computed on a
rounded (based on currency precision) quantity * price. This would cause
issues as orders in the backend would have a different total price as
calculated in the frontend.

An example that used to trigger the problem:

Order with orderline with product with price of 5, excluded tax of 21%
and a quantity of 0.985. This would cost 5.96 in the frontend and 5.97
in the backend.

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