[FIX] sale management : fix purchase price on order line after confirming the order

Steps to follow to reproduce the bug:
In Odoo - V14
-Go to sales app
- Create a product and give it for example a “sales price” of 200 and a “cost” of 100. Select a category of product with "Costing Method == Standard Price"
- Create a new Quotation/Order
- Add the product you just created
- Modify in the order line, the value of cost from 100 to 120 for example.
- Save the sale order and confirm it

Problem :
The final price is calculated in relation to the base price of the product and never takes price changes into account.

Solution :
Check if the "Costing method" of the product category is "Standard price". If it's the case, do not change the "purchase_price" defined in the order line.

opw-2451721

closes odoo/odoo#67106

Signed-off-by: Rémy Voet <ryv-odoo@users.noreply.github.com>

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