add access check for post previews

app/presenters/post_presenter.rb

@@ -4,6 +4,10 @@ class PostPresenter < Presenter
       return ""
     end
     
+    unless Danbooru.config.can_user_see_post?(CurrentUser.user, post)
+      return ""
+    end
+    
     flags = []
     flags << "pending" if post.is_pending?
     flags << "flagged" if post.is_flagged?

app/views/forum_topics/show.html.erb

@@ -17,7 +17,7 @@
     
     <p><%= link_to "Reply &raquo;".html_safe, new_forum_post_path(:topic_id => @forum_topic.id) %></p>
     
-    <div style="display: none;" id="topic-response">
+    <div id="topic-response">
       <%= render "forum_posts/form", :forum_post => ForumPost.new(:topic_id => @forum_topic.id) %>
     </div>