Fixes animation video from not playing after onStop

Adds a pause command that doesn't destroy the video surface, and calls
onStop when we want to destroy the media player.

bug:26516460
Change-Id: If46d26088e81fdca6a73a663a48901bb5245acc8

src/com/android/settings/fingerprint/FingerprintLocationAnimationView.java

@@ -112,6 +112,11 @@ public class FingerprintLocationAnimationView extends View implements
         }
     }
 
+    @Override
+    public void pauseAnimation() {
+        stopAnimation();
+    }
+
     private void startPhase() {
         startRadiusAnimation();
         startAlphaAnimation();