[FIX] sale_management: optional product

- Activate 'Multiple prices per product'
- Create a Product A, and add an entry in the 'Pricing' section of the
  product form
- Create a SO, a product, and add A in the 'Optional Products' tab.
- Click on 'Add to order lines'

A crash occurs at currency conversion.

When getting the conversion rate, the company is empty in method
`_get_conversion_rate`. This is because the company is a stored related
field, which is computed after creation. However, the method
`_prepare_add_missing_fields` is called before creation. This method
calls several onchange methods, one of them computing a price
conversion.

We explicitly add the company when creating the SO line.

opw-1939106

closes odoo/odoo#31455

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