Bluetooth: host: Fix adv object not released on directed adv timeout

Fix the advertise object not release when a high-duty cycle directed
advertiser timeout happens. If the extended advertising feature has been
enabled in the host, but not supported by the controller then the
advertising object must be released in the connection complete event
since there will not be a advertising set terminated event.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>