Since [1], highlighting a pinned message from the notification sent to the channel does not work anymore. This is due to a `super` call missing. This PR fixes the issue. Steps to reproduce: - Go to a channel - Pin a message - Click on the "message" link - Nothing happens [1]: https://github.com/odoo/odoo/pull/121418 closes odoo/odoo#139948 X-original-commit: 68992ba05eb48459800df17707741295a4f47c9c Signed-off-by: Matthieu Stockbauer (tsm) <tsm@odoo.com>