Thibault Delavallée
5b332e2d28
Purpose of this commit is to cleanup context usage in composer
* remove now dead 'custom_layout' context keys that was present mainly for
compatibility until Odoo v15. You should now correctly use default value
for 'email_layout_xmlid' field like every field;
* remove 'mail_auto_delete' context key, not used anywhere in codebase.
Auto-delete field of composer will be improved soon so that setting it
as every field will replace the context usage;
* remove usage of self._context, to use self.env.context;
Task-2710804 (Mail: Clean MailThread Posting API)
Part-of: odoo/odoo#99482