LMS: adds verifiied track visuals to upgrade UI on dashboard

lms/templates/dashboard/dashboard_course_listing.html

@@ -122,6 +122,7 @@
               <ul class="actions message-actions">
                 <li class="action-item">
                   <a class="action action-upgrade" href="${reverse('course_modes_choose', kwargs={'course_id': course.id})}?upgrade=True">
+                    <img class="deco-graphic" src="${static.url('images/vcert-ribbon-s.png')}" alt="ID Verified Ribbon/Badge">
                     <span class="wrapper-copy">
                       <span class="copy">${_("Upgrade to Verified Track")}</span>
                     </span>