Fix post ordering in reply view

I think this was database-specific. Replies should now be ordered by
their ID.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/templates/board/post_detail.html

@@ -44,7 +44,7 @@
 {# posts #}
 <div class="row thread">
     {% include "board/post_snippet.html" %}
-    {% for post in post.replies.all %}
+    {% for post in replies %}
     <div class="row reply">
         {% include "board/post_snippet.html" %}
     </div>