Before this commit, there was the following issue
in the chatter:
- on document with customer field set;
- open the composer;
- post a message with suggested partner checkbox set;
=> the partner is not added as a follower of the document
This was caused by a typo when refactoring the JS of the
module mail.
Task-ID 1896010
Closes#27864closesodoo/odoo#27932