Don't set udfps icon visibility on illumination change

We don't need to set it to invisible for LHBM. On AOD udfps-auth there
would be a delay on re-showing the icon.

Test: manual
Fixes: 192411694
Change-Id: I3a601d2345706399039311e5fe7393b9ae2bf593

packages/SystemUI/src/com/android/systemui/biometrics/UdfpsKeyguardView.java

@@ -114,12 +114,10 @@ public class UdfpsKeyguardView extends UdfpsAnimationView {
 
     @Override
     void onIlluminationStarting() {
-        setVisibility(View.INVISIBLE);
     }
 
     @Override
     void onIlluminationStopped() {
-        setVisibility(View.VISIBLE);
     }
 
     @Override