[FIX] sale: fix order line amount update after downpayment invoice

Create a standard tax included in the product price.
Add that tax to a product and the down payment product.
Create a sales order (i.e. 1 line, 100$ total, 15% tax incl).
Create a percentage down payment invoice, i.e. 50%.
Post the downpayment invoice.
Go back to the sale order

The sale order line relative to the downpayment was asjusted to remove
the tax amout while this should not occur when dealing with tax included
in price

Added test

opw-2426294

closes odoo/odoo#65813

Signed-off-by: agr-odoo <agr-odoo@users.noreply.github.com>

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