Use flex instead of equalizer in polls results

Note that the sidebar class isn't used since commit b91b766e9, so we're
removing it.

app/components/polls/results_component.html.erb

@@ -5,8 +5,8 @@
 
   <%= render "poll_subnav" %>
 
-  <div class="row margin" data-equalizer data-equalize-on="medium">
-    <div class="small-12 medium-3 column sidebar" data-equalizer-watch>
+  <div class="polls-results-content">
+    <div>
       <p><strong><%= t("polls.show.results.title") %></strong></p>
       <ul class="menu vertical">
         <%- poll.questions.each do |question| %>
@@ -15,7 +15,7 @@
       </ul>
     </div>
 
-    <div class="small-12 medium-9 column" data-equalizer-watch>
+    <div>
       <%= render Polls::Results::QuestionComponent.with_collection(poll.questions) %>
     </div>
   </div>