Switch to side-by-side view

--- a/Allura/allura/templates/repo/diff.html
+++ b/Allura/allura/templates/repo/diff.html
@@ -1,4 +1,4 @@
-{% extends 'repo/repo_master.html' %}
+{% extends 'allura:templates/repo/repo_master.html' %}
 {% do g.register_forge_css('css/forge/hilite.css') %}
 
 {% block title %}
@@ -40,4 +40,4 @@
   <style type="text/css">
     .clip h3 {margin-bottom: 0;}
   </style>
-{% endblock %}+{% endblock %}