[IMP] event: improve kanban and form view
[IMP] event: improve kanban and form view

Now the avatar on the kanban view is round as
in the others kanban views.

task 2198634
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo