Fixed the issue that the MainSwitchPreference is invalid after the
page is resumed.

- MainSwithBar will be recreated after the page is resumed. We
  should keep the OnMainSwitchChangeListener for
  MainSwitchPreference and re-register the listeners after the
  page is resumed.

Bug: 225289727
Test: manual test and see the UI
Change-Id: I1b959f36fbd4c57fddf6b37ea00f11c486bbe5b9
1 file changed