[FIX] mail: Access error closing chat

Current behavior:
After creating a group chat in the discuss app you were not able to close it.

Steps to reproduce:
-Create a group chat with more than one user in the discuss app
- Try to leave it
- You get an access error

opw-2736464

closes odoo/odoo#83717

X-original-commit: cc1c132ee092368e77108f327ecdc5a6d2c490a6
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>
Signed-off-by: Engels Robin (roen) <roen@odoo.com>

addons/mail/models/mail_channel.py

@@ -99,7 +99,7 @@ class Channel(models.Model):
 
     @api.constrains('channel_last_seen_partner_ids', 'channel_partner_ids')
     def _constraint_partners_chat(self):
-        for ch in self.filtered(lambda ch: ch.channel_type == 'chat'):
+        for ch in self.sudo().filtered(lambda ch: ch.channel_type == 'chat'):
             if len(ch.channel_last_seen_partner_ids) > 2 or len(ch.channel_partner_ids) > 2:
                 raise ValidationError(_("A channel of type 'chat' cannot have more than two users."))