Don't enable Bluetooth when booting into airplane mode.

When airplane mode is enabled and the phone is rebooted, Bluetooth
should not turn on. Previously the airplane mode setting was ignored
and only the Bluetooth enabled setting was used to determine whether
to enable Bluetooth at boot time. Now, both settings are checked.

Bug: 3404790
Change-Id: I5e3095a94e50825dd469addebef97a7c85041fca