_dbus_daemon_is_session_bus_address_published() does more in name specified

While working on #235 (closed), the _dbus_daemon_is_session_bus_address_published() function was used in an Autolaunch test program for an internal check as to whether autostart is enabled or not.

It was found that this function is not suitable for the intended purpose as it blocks autolaunch support at the same time.