Group code for the poll callout together

Some of the code was in its own component, while some of the code
remained in the polls/show view.

Note that we're re-structuring the code a little bit, so it's clear that
the "already voted" messages are only shown when users can vote. Also
note that now the `can?` condition involves the existence of a
`current_user` and that the poll is not expired, so we can simplify the
`voted_in_web` condition.

app/components/polls/callout_component.html.erb

@@ -1,4 +1,14 @@
-<% unless can?(:answer, poll) %>
+<% if can?(:answer, poll) %>
+  <% if poll.voted_in_booth?(current_user) %>
+    <div class="callout warning">
+      <%= t("polls.show.already_voted_in_booth") %>
+    </div>
+  <% elsif poll.voted_in_web?(current_user) %>
+    <div class="callout warning">
+      <%= t("polls.show.already_voted_in_web") %>
+    </div>
+  <% end %>
+<% else %>
   <% if current_user.nil? %>
     <div class="callout primary">
       <%= sanitize(t("polls.show.cant_answer_not_logged_in",

app/views/polls/show.html.erb

@@ -17,20 +17,6 @@
   <div class="row margin">
     <div class="small-12 medium-9 column">
       <%= render Polls::CalloutComponent.new(@poll) %>
-
-      <% if @poll.voted_in_booth?(current_user) %>
-        <div class="callout warning">
-          <%= t("polls.show.already_voted_in_booth") %>
-        </div>
-      <% else %>
-
-        <% if current_user && @poll.voted_in_web?(current_user) && !@poll.expired? %>
-          <div class="callout warning">
-            <%= t("polls.show.already_voted_in_web") %>
-          </div>
-        <% end %>
-      <% end %>
-
       <%= render Polls::FormComponent.new(@web_vote) %>
     </div>
   </div>