[IMP] new step in tour

It also fix problem with last timeouted step

res_partner_mails_count/static/src/js/res_partner_mails_count_tour.js

@@ -21,6 +21,11 @@ odoo.define('res_partner_mails_count.res_partner_mails_count_tour', function (re
                 element:   '.mails_to',
                 waitFor:   '.mails_to:visible',
             },
+            {
+                title:     _t("Messages are found!"),
+                placement: 'left',
+                element:   '.o_mail_thread',
+            },
             {
                 wait:   '8000',
                 waitFor:   '.o_channel_name.mail_archives:visible',