Proxy only mode not handled properly

Migrated from: https://tracker.clearos.com/view.php?id=4752

Reported by: Peter Baldwin

The "proxy only" (i.e. no content filter) in non-transparent mode is not properly handled. In the case where user authentication is enabled, traffic through 80/443 is blocked and the user is forced through the proxy. In the case where user authentication is disabled (a plain old non-transparent proxy), traffic through 80/443 is not blocked.

Not a typical use case, but it should be fixed. The change is small but best suited for a proper beta trial.

Developer comment:

It works for non-transparent, authenticated. Code could be cribbed from there?