Re-arrange feedback, fix rubric HTML issue

lms/templates/open_ended_feedback.html

 <section>
-    <header></header>
     <div class="shortform-custom" data-open-text='Show detailed results' data-close-text='Hide detailed results'>
         <div class="result-output">
             <p>Score: ${score}</p>
-            ${rubric_feedback | n}
         </div>
+        ${rubric_feedback | n}
     </div>
     <div class="longform">
         <div class="result-output">

lms/templates/open_ended_rubric.html

@@ -36,5 +36,5 @@
                 % endfor
             </ul>
         % endfor
-    </table>
+    </div>
 </form>