Animate away instead of suddenly disappearing

In certain cases, such as when callers cancel authentication,
we are not animating away nicely. This fixes it.

Bug: 152240892
Test: atest android.server.biometrics.BiometricSimpleTests#testBiometricCancellation
Change-Id: I7e23de1453856afa2aec877792f8bdb76475d592

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

@@ -589,7 +589,7 @@ public class AuthContainerView extends LinearLayout
 
     @Override
     public void dismissFromSystemServer() {
-        removeWindowIfAttached();
+        animateAway(false /* sendReason */, 0 /* reason */);
     }
 
     @Override