Bluetooth: Fix advertising parameter update when toggling connectable

When we change the connectable state and have advertising enabled we
should update the advertising parameters no matter what. The code was
incorrectly only updating them if advertising was not already active.
This patch fixes the issue.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>