[FIX] sale: Price on SO not working with different uom

Steps to reproduce the bug:

- configuration on sale:
   - Unit of measure: Some products may be sold/purchased in different units of measure (Advanced)
   - Sale Price: Advaced pricing based on formulas (discounts, margins, rounding)
   - Discount: Allow discounts on sale order lines
- kg as the Reference UOM for weight
- create an uom 10 kg
   - Category: Weight
   - Type: Bigger...
   - Bigger ratio: 10.0
- create a product P
   - Sale price: 100
   - Unit of measure: kg
   - Purchase UOM: kg
- create a pricelist "My pricelist"
   - Discount policy: Show public price & discount to the customer
   - Items : All products - 10% discount
- create a SO with "My pricelist"
- create a SO line with P, the unit price is automatically 90 with 10 % of discount
- change the uom of the line with 10kg

Bug:

The unit price of the line didn't change and the discount on the line disappeared.

In function product_uom_change, the uom of the SO line has been set in the context
of the product(like in function product_id_change). So in funciton _get_display_price,
the function _get_real_price_currency must be called with the uom of product in the context.
In this way, the lst_price will be fetch on product with the right uom without any bad conversion
(because uom.id == product_uom with uom from the parameters and product_uom from the context).

But with function get_product_price_rule, no need to call this function with the uom in context as
it is already set in the product(check "if uom_id: ... else ..." in this function).

The same logic has been applied in function _onchange_discount

opw:186385

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