[FIX] point_of_sale: include untaxed amounts in tax lines

If some orders have no taxes (e.g. manual reimbursement with a negative amount)
the sum of taxes lines gave a different result than the total amount sold.

e.g.:
order 1: price 10€, including 2€ for taxes
order 2: price -5€, no taxes

report:
  taxes:
   20%, 2€ taxes, 8€ base amount

  total sold:
   5€

2+8 != 5

Also change line.price_subtotal as it was computed twice if there was two taxes
on a line (although it will probably never happen in the pos)

opw-805415

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