[FIX] mail_client_extension: link new company with existing partner

If the partner was created then the company, the api would return the
partner, find the corresponding company and return it with the
partner, but not actually link the newly found/created company with
the partner in the db.
Would happen for example if the user had no reveal credit when he
added the partner. Then credited his account and opened an email from
the same partner again, triggering the creation and enrichment of the
company.

closes odoo/odoo#57825

X-original-commit: 5879f7dede16c8ba574ed648e4c91ca438eb93fa
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

addons/mail_client_extension/controllers/main.py

@@ -220,6 +220,7 @@ class MailClientExtensionController(http.Controller):
                 if not company: # create and enrich company
                     company, enrichment_info = self._create_company_from_iap(sender_domain)
                     response['enrichment_info'] = enrichment_info
+                partner.write({'parent_id': company})
                 response['partner']['company'] = self._get_company_dict(company)
         else: #no partner found
             response['partner'] = {