Fix infinite redirect when logged in

By default the `permission_required` decorator redirects
to the login url when you don't have sufficient permissions.
The result of this is if a user navigates to a page they
don't have permission to view they end up in an infinite
redirect loop between the forbidden page and the login page.

This change will allow logged out users a chance to login but
return forbidden when you don't have sufficient permissions.

commentary/views/moderation.py

@@ -39,6 +39,7 @@ def flag(request, comment_id, next=None):
 
 
 @csrf_protect
+@login_required
 @permission_required('commentary.can_moderate')
 def delete(request, comment_id, next=None):
     """
@@ -65,6 +66,7 @@ def delete(request, comment_id, next=None):
 
 
 @csrf_protect
+@login_required
 @permission_required("commentary.can_moderate")
 def approve(request, comment_id, next=None):
     """