Master warning message account yti

- Task: https://www.odoo.com/web#id=9437&view_type=form&model=project.task&action=333&active_id=248
- Pad: https://pad.odoo.com/p/r.wWl3csfJGZ81mgG4
Fabien wanted to remove the icon. But I think that it is better with it. So I simply commented it in case he changes his mind.