use 'me' instead of 'user' consistently

views/topics/topic.etlua

@@ -22,7 +22,7 @@
 <p>This topic is locked.</p>
 <% end %>
 
-<% if user:is_mod() then %>
+<% if me:is_mod() then %>
   <br>
   <a href="<%= url_for("topic_edit", {slug = topic.slug}) %>">Edit topic</a>
   <form method="post" action="<%= url_for("topic_edit", {slug = topic.slug}) %>">

views/topics/topics.etlua

@@ -11,6 +11,6 @@
   <% end %>
 <% end %>
 </ul>
-<% if user:is_mod() then %>
+<% if me:is_mod() then %>
 <a href="<%= url_for("topic_create") %>">Create new topic</a>
 <% end %>