Settings: BT input device option for all paired devices is not right.

Settings activity is destoryed in this case, that causes the
previous fragment cannot be removed when BT Settings dialog being
dismissed.

Set static flags to record state and remove the duplicated
fragment from static view.

CRs-Fixed: 760896

Change-Id: I190e8d910aff465a0b093962d7a01754b7a836ed