Fingerprint: Call SecurityCallback.dismiss when recognized

In order for lock screen shortcuts to work correctly when the user
uses their fingerprint to unlock the device, we need to call the
SecurityCallback.dismiss() method so that the OnDismissAction is
called once the user is authenticated.

Change-Id: I3c55d1e4249c6c935b0bf350b4e45f556cdc0bcb
REF: CYNGNOS-767