Studio: resolving post-course rerun outline UI alert icon display issue

UX-1054

cms/templates/course_outline.html

@@ -40,7 +40,7 @@ from contentstore.utils import reverse_usage_url
   %if notification_dismiss_url is not None:
   <div class="wrapper wrapper-alert wrapper-alert-announcement is-shown">
     <div class="alert announcement has-actions">
-      <i class="alert-symbol icon-bullhorn"></i>
+      <i class="feedback-symbol icon-bullhorn"></i>
 
       <div class="copy">
         <h2 class="title title-3">${_("This course was created as a re-run. Some manual configuration is needed.")}</h2>

cms/templates/js/mock/mock-course-rerun-notification.underscore

 <div id="page-alert">
     <div class="wrapper wrapper-alert wrapper-alert-announcement is-shown">
         <div class="alert announcement has-actions">
-            <i class="alert-symbol icon-bullhorn"></i>
+            <i class="feedback-symbol icon-bullhorn"></i>
 
             <div class="copy">
                 <h2 class="title title-3">This course was created as a re-run. Some manual configuration is needed.</h2>
@@ -21,4 +21,4 @@
             </ul>
         </div>
     </div>
-</div>
\ No newline at end of file
+</div>