[FIX] purchase: generate invoice lines from purchase lines

The invoice lines were generated almost fully from the given purchase line.
For a few field, the information was retrieved from the purchase order selected
in the onchange.
In standard it makes no difference but the purpose of this generic method is to
rely only of the line given as parameter.

In the scenario of extensions to generate invoice lines from several purchase
orders, this method could not be used as was relying on the previously selected
purchase order.
This was done at OCA/purchase-workflow#319

This commit ensure to only rely on givem `line` to generate invoice lines.

Closes #15104

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