[FIX] mail: clean context for mail_activity feedback

Steps to reproduce:
-install projects
-go to projects > configuration > check the sub-tasks option
-create a project with a sub-task and add an activity on the sub-task

Previous behavior:
attempting to mark an activity as done directly from the chatter
will raise an error similar to
"Records does not exist or has been deleted (Record: mail.message (x), User: y)"

Current behavior:
activity can be marked as done trough the feedback button

opw-2126704

closes odoo/odoo#42383

X-original-commit: 06d72a1ab84f3685f547c8a04a2d3e1405e5d188
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/mail/models/mail_activity.py

@@ -413,6 +413,7 @@ class MailActivity(models.Model):
         return messages.ids and messages.ids[0] or False
 
     def action_feedback(self, feedback=False, attachment_ids=None):
+        self = self.with_context(clean_context(self.env.context))
         messages, next_activities = self._action_done(feedback=feedback, attachment_ids=attachment_ids)
         return messages.ids and messages.ids[0] or False