[Settings] Update UI when bluetooth connection is down.

 - When Airplane mode on, all connection shall be disconnected. In
   current design, when bluebooth disconnected, network page in Settings
   does not udpate the UI.

Bug: b/246925011
Test: Maunal
Change-Id: I1bf56e96737157d8e76057028b22e94e0e8d76e4