[FIX] purchase: anglosaxon accounting: use price difference account properly when making a refund

Before that, the following scenario failed due to FIFO handling of stock:

- make PO 1 for 10 x product A at 10€/piece, receive and invoice everything
- make PO 2 for 10 x product A at 20€/piece, receive and invoice everything
- refund and send back PO 2

=> With FIFO handling, it means the valuation corresponding to the return of product A consists of the first received products, hence 10x10=100€. The credit note, though, was made with the price of the invoice (200€) and did not (because of a too simple check) use the price difference account to post the missing amount (100€).
Test test_fifo_anglosaxon_return (purchase/tests/test_stockvaluation.py) failed because of that.

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