[FIX] website_crm: fix access error for users without CRM rights

1. Backport of [1].
2. Steps to reproduce:
- Install website_crm
- Connect as Admin and remove the sales rights for Demo
- Check the website on a private window (to create an anonymous visit)
- Connect as Demo on the normal window
- Go to Website > Reporting > Visitors
=> It triggers an access error due to lead_ids being restricted to
sales_team.group_sale_salesman.
(Note: the error sometimes isn't triggered at that point. In that case,
click on the visitor: the same error will trigger.)

Considering the computed field doesn't do anything critical as it just
retrieves the email and phone number, the restriction is overridden on
the field.

[1]: https://github.com/odoo/odoo/commit/7de453477d7c23e607a15e0d60613080857e3371

opw-3475301

closes odoo/odoo#136362

X-original-commit: 70faf9bb07c9d801b3b06b325fc33de66c8406f3
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website_crm/models/website_visitor.py

@@ -21,7 +21,7 @@ class WebsiteVisitor(models.Model):
         super(WebsiteVisitor, self)._compute_email_phone()
 
         left_visitors = self.filtered(lambda visitor: not visitor.email or not visitor.mobile)
-        leads = left_visitors.mapped('lead_ids').sorted('create_date', reverse=True)
+        leads = left_visitors.sudo().mapped('lead_ids').sorted('create_date', reverse=True)
         visitor_to_lead_ids = dict((visitor.id, visitor.lead_ids.ids) for visitor in left_visitors)
 
         for visitor in left_visitors: