Pairing dialog is not cleared from UI after remote reject paring

- This is happening because of remote is sending pairing request
  and immediately sending the disconnection request. Because of
  the framework delay, pairing dialog is getting displayed after
  disconnection request came to DUT from remote.
  due to this BT pairing dialog is not getting cleared.
- This patch will clear the pairing dialog.

Change-Id: I98b9fd545894325190f025b36c9293ed08f44aa9
CRs-Fixed: 1065707