[FIX] website_quote: invoice generation

To reproduce:
- Configure an external payment provider (e.g. Ingenico) with "Authorize
  & capture the amount, confirm the SO and auto-validate the invoice on
  acquirer confirmation"
- Create a quotation with a product linked to a subscription
- Send the link to the customer
- Click on "Accept & Pay", use the configured provider

The SO is confirmed, but the invoice is not generated.

By calling `action_confirm` in the callback of the transaction, we
validate the SO before `form_feedback` is called. Therefore, the method
`_confirm_so` will do nothing since the SO is not in state 'draft' or
'sent' anymore.

The solution is to manually call `_confirm_so`instead of
`action_confirm`. This is necessary to do it at this moment since we
might not go through `form_feedback` (e.g. if we pay thanks to wire
transfer).

opw-694273

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