[FIX] sale_stock: unit price rounding

Rounding the unit price at that moment is a bad idea. Here is the use
case:
- Set the product 'Costing Method' to 'Real Price'
- Set the product 'Inventory Valuation' to 'Perpetual'
- Receive through a PO 9 products for a unit price of 115.80
- Receive through a PO 35 products for a unit price of 116.80
- Sell these 44 products thanks to a SO, generate and validate the
  invoice

On the Stock Output Account, the following entries will be generated:
- First PO --> 1042.20  = 9  * 115.80
- Second PO --> 4088.00 = 35 * 116.80
- Invoice --> 5130.22   = 44 * 116.596

116.596 is the average price of the two POs, but rounded. The issue is
that there are 2 cents of difference... Nice ;-)

The fix is to avoid the rounding of the unit price, since we don't even
store it on the account move line anyway.

opw-673976

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