[FIX] sale_margin: apply same logic than sale override

If some required fields are not present in the created values, they are computed
based on the onchange.
This was introduced at 5c4765130 to allow to import sale order lines without
specifying uom.

If sale_margin is installed, the same issue will occure as it assumes there is
a value for product_uom

Add test, courtesy of Mourad Elhadj Mimoune, Akretion

Closes #17613

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