[IMP] web: rounded avatar in kanban cards

closes odoo/odoo#43779

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/scss/kanban_view.scss

@@ -119,6 +119,7 @@
                 flex: 0 1 auto;
 
                 .oe_kanban_avatar {
+                    border-radius: 50%;
                     width: 20px;
                     height: 20px;
                     object-fit: cover;