[web client] Radio buttons glitches

- Task: https://www.odoo.com/web#id=10498&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.LQ5B1aBjE8jD1eU8
Won't that break when switching from a record with a value set for the field to a record with no value set?