Prior to this commit, if the avatar image didn't have a 1:1 ratio, the `rounded-circle` image would be oval instead of the intended circle. To fix this we add the `o_avatar` class to the `img`, and since this class already contains `object-fit: cover` from the element's inline styles. closes odoo/odoo#143109 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>