Dialer: Donot do transactions after onSaveInstanceState

Fragment manager try to popBackStack() after onSaveInstanceState().

If onSaveInstanceState() has been called, just return in exitSearchUi()
since we can't do any constructive here.

CRs-Fixed: 713587

Change-Id: I4aa3e33d7094e6098cef4e525e464ae38da5be47