[FIX] privacy: Change _default_controller_id() to partner_id.

TT344

privacy/models/privacy_activity.py

@@ -40,4 +40,4 @@ class PrivacyActivity(models.Model):
     @api.model
     def _default_controller_id(self):
         """By default it should be the current user's company."""
-        return self.env.user.company_id
+        return self.env.user.company_id.partner_id