[FIX] purchase: _anglo_saxon_purchase_move_lines

Let's consider a stockable product P with a product category PC with costing method = real price,
valuation = perpetual, stock valuation account = SVA and price diff account = PDA.
The cost defined for P in product.template is equal to 1$.

Steps

-Create a PO for P with a price unit = 5$
-Confirm PO and generate the invoice
-Update the qty for P in the invoice and validate it(price unit is still 5$)

Bug:

In the general ledger: a move with a debit of 1$ is created for SVA and a debit of 4$
is created for PDA which is wrong. The expected result is: just a move of 5$ created
for SVA and nothing for PDA because the difference between the purchase price and the
invoiced price is 0.

This commit fixes this problem.

NB: in real price and average price, the considered cost must be the purchase price
and not the cost defined in the product template.

opw:740879

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