[FIX] point of sale: function is_paid:

When rounding globally, the function compute_all in charge to compute the taxes for
each line uses a very high currency rounding to avoid rounding per line.
The round must be done on the sum of each total amount line with taxes. To validate a payment with the pos,
the function is_paid verified that this sum is the same that the amount just paid.
Inspired from "sale.order.line", the precision of 'price_unit' and 'price_subtotal' in "pos.order.line"
must be taken from 'Product Price' to avoid rounding per line.

ps: we could not use the function get_all_prices to round globally because it used on every line.

Fixes #6681
Closes #6682
opw:639686

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