[REF] stock_account: unit price of rereturn

`_get_price_unit` is used to get the price to value a stock move and
returns `unit_price` if present (most of the times it is set by purchase_stock
to copy the price unit of po line) or the standard price.

Note that a return copies the original move and `price_unit` is set as
copy False.

Before this patch, a return of a return used the standard price (due to
the copy False), which doens't bring any issue but could be confusing
as explained in the following receipt scenario.

On a receipt, return and rereturn. The original and rereturn move may
not have the same price if the standard price has changed between the
operations, which is weird since there's a unit price on a potentially
linked po line.

On an delivery, there won't be any effect since the valuation methods do
not use the result of `_get_price_unit` but force it to the standard
price (standard and avco) or run fifo.

task-1875873

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