[FIX] sale: set correct invoice status

Steps to reproduce:
- Create a quotation
- Add a product that is invoiced on "ordered quantities" and set the
  quantity to a negative number.
- Leave 'delivered' to 0
- Confirm the quotation
- Create the Invoice and validate it.
- Go to the SO list view (Orders > Orders)

You should see that the Invoice Status of the order you just created is
'Upselling Opportunity', which is not correct.

Why this is happening:

Here's an explanation on the 'Upselling Opportunity' state (found in
the code):
" upselling: this is possible only for a product invoiced on ordered
quantities for which *we delivered more than expected.* "

In our case, the invoice line's state is set to 'upselling'
because we have a negative ordered quantity and a zero delivered
quantity (i.e. we delivered more than expected)

opw-2895218

closes odoo/odoo#97015

Signed-off-by: Nshimiyimana Serge Séna (sesn) <sesn@odoo.com>