[FIX] mail: reply to note

- Handle the notifications in Odoo
- On any object, e.g. a SO, user A a note and ping user B
- As user B, go to Discuss and reply to the note

The reply is sent a regular message.

Actually, everything is available to reply with the right message type
in:

https://github.com/odoo/odoo/blob/bae8ab7d93143e082e1d1a9cbe20a350c2d34d07/addons/mail/static/src/js/discuss.js#L1327

It is simply unset.

opw-2088619

closes odoo/odoo#40946

X-original-commit: 84c8221c60e3483aa637abad057253424236af83
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/mail/static/src/js/models/messages/message.js

@@ -759,6 +759,7 @@ var Message =  AbstractMessage.extend(Mixins.EventDispatcherMixin, ServicesMixin
         this._documentID = data.res_id;
         this._emailFrom = data.email_from;
         this._info = data.info;
+        this._isNote = data.is_note;
         this._moduleIcon = data.module_icon;
         this._needactionPartnerIDs = data.needaction_partner_ids || [];
         this._starredPartnerIDs = data.starred_partner_ids || [];