poll widget: Move the "Add option" feature below options.

This is the more normal ordering for a poll.  Fixes part of #11010.

static/templates/widgets/poll-widget.handlebars

@@ -1,5 +1,7 @@
 <div class="poll-widget">
     <h4 class="poll-question-header"></h4>
+    <ul class="poll-widget">
+    </ul>
     <div class="poll-question-bar">
         <input type="text" class="poll-question" placeholder="{{t 'Question'}}" />
         <button class="poll-question">{{t "Add question" }}</button>
@@ -9,6 +11,4 @@
         <button class="poll-comment">{{t "Add option" }}</button>
     </div>
     <br />
-    <ul class="poll-widget">
-    </ul>
 </div>