Fixed "order by last update" link in repo list.

templates/repo_list.html

@@ -4,7 +4,7 @@
 <h2>
   Repositories
   <span>
-    (<a href=?by-last-update>order by last update</a>)
+    (<a href=?by-last-update=yep>order by last update</a>)
   </span>
 </h2>
 <ul class=repolist>