[FIX] purchase_stock: discount on invoice

- Create a product P
Costing Method: FIFO
Inventory Valuation: Perpetual (automated)
Price Difference Account set
- Create a PO with P, set a price of 100 (no tax).
- Receive the product

2 journal items are generated:

|                 Account |   Debit|  Credit|
|-------------------------|--------|--------|
| Stock Valuation         |   100.0|     0.0|
| Stock Interim (Received)|     0.0|   100.0|

- Create the corresponding invoice
- Change the:
Discount: 10
- Validate the invoice (for a total of 90.0)

2 journal items are generated:

|                 Account |   Debit|  Credit|
|-------------------------|--------|--------|
| Account Payable         |     0.0|    90.0|
| Stock Interim (Received)|    90.0|     0.0|

This is not correct, it should be:

|                 Account |   Debit|  Credit|
|-------------------------|--------|--------|
| Account Payable         |     0.0|    90.0|
| Difference Account      |     0.0|    10.0|
| Stock Interim (Received)|   100.0|     0.0|

This comes from the fact that the valuation price is compared to the
price unit without the discount.

opw-1974002

closes odoo/odoo#33296

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

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