Don't allow banned ip addresses to make changes

Previously banned ip addresses couldn't make new accounts, but if they
get an account somehow the ip ban wouldn't prevent them from making
edits.

app/logical/anonymous_user.rb

@@ -40,6 +40,10 @@ class AnonymousUser
     false
   end
 
+  def is_banned_or_ip_banned?
+    false
+  end
+
   def has_mail?
     false
   end