[FIX] mail: tracking_value_ids field group

Give a coherent group as otherwise we could have access errors. Simple
case: an Admin Rights user goes into a mail message form which is only
available in debug mode which sets `group.no_one` into such user. This
model is only readeable by `base.group_sytem` so an AccessError will
raise.

closes odoo/odoo#70102

X-original-commit: 8930e082
Signed-off-by: Simon Goffin (sig) <sig@openerp.com>
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/mail/models/mail_message.py

@@ -109,7 +109,7 @@ class Message(models.Model):
     tracking_value_ids = fields.One2many(
         'mail.tracking.value', 'mail_message_id',
         string='Tracking values',
-        groups="base.group_no_one",
+        groups="base.group_system",
         help='Tracked values are stored in a separate model. This field allow to reconstruct '
              'the tracking and to generate statistics on the model.')
     # mail gateway