[FIX] sale_stock_margin: compute product uom qty

When confirming a SO, if a line uses a different UoM than the default
UoM of the line product, the computed cost will be updated to the
product unit cost.

To reproduce the error:
1. In Settings, enable:
    - Units of Measure
    - Margins
2. Create a product P
    - Sales Price: $100
    - No customer taxes
    - Cost: $50
    - UoM: Units
3. Create a SO
    - Add P
    - Set the line UoM to 'Dozens'
4. Display the order line field "Cost"
    - [Note] As you can see, since UoM is 'Dozens':
        - Unit Price: $1200
        - Cost: $600
5. Confirm the SO

Error: Line cost becomes $50 (the cost of one P-product). Since the UoM
of the line is 'Dozens', Cost should be $600 (as before confirming the
SO). As a result, this error creates incorrect data in the margins
(95.83% instead of 50%).

OPW-2444335

closes odoo/odoo#67397

Signed-off-by: Adrien Widart <adwid@users.noreply.github.com>

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