webish: re-fix the addSlash issue in directory rendering

having fixed the relevant unit test not to assert incorrect behaviour of
the node when rendering directories, it's now safe to fix the latter.

src/allmydata/web/directory.py

@@ -367,7 +367,7 @@ class DirectoryAsHTML(rend.Page):
     # The remainder of this class is to render the directory into
     # human+browser -oriented HTML.
     docFactory = getxmlfile("directory.xhtml")
-    #addSlash = True
+    addSlash = True
 
     def __init__(self, node):
         rend.Page.__init__(self)