Fixes randomly-failing travis specs

The problem was that after changing page with the selects, capybara
needs to “find something which has changed on the page” in order to
“wait”. The “have_selects” did not wait because they did not change
(you change them, then the page changes, and they stay the same)

app/views/debates/index.html.erb

@@ -38,7 +38,7 @@
   </div>
 
   <div class="row">
-    <div id="debates" class="debates-list small-12 medium-9 column">
+    <div id="debates" class="debates-list small-12 medium-9 column js-order-<%= @order.dasherize %>">
       <%= render @debates %>
       <%= paginate @debates %>
     </div>