[FIX] portal: allow to delete res.partner

Do these steps:

1. Create a partner.
2. Grant him portal access through *Actions > Portal Access Management*.
3. Delete the created user.
4. Delete the partner.

You will get this error:

```
Odoo Warning - Validation Error
The operation cannot be completed, probably due to the following:
- deletion: you may be trying to delete a record while other records still reference it
- creation/update: a mandatory field is not correctly set

[object with reference: Portal User Config - portal.wizard.user]
```

This happens because the wizard (which is a transient model) does not let the partner to be deleted.

With this patch, we avoid that bug.

Closes #12608

0 files changed, 0 insertions, 0 deletions