[FIX] mail,sms: avoid event propagation on avatar click in message list

Before this commit, when a user click on the author avatar inside the message
list, it trigger the o-clicked for the message.

task-2341603

closes odoo/odoo#61400

Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>
Co-authored-by: Sébastien Theys <seb@odoo.com>