Queue events if enrollment sidecar listener is null

Fixes: 38102355

Test: manual
Change-Id: I98bd347ee98117f7489376abd94d276d20e7b762

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

@@ -159,6 +159,14 @@ public class FingerprintEnrollEnrolling extends FingerprintEnrollBase
         startIconAnimation();
     }
 
+    @Override
+    protected void onPause() {
+        super.onPause();
+        if (mSidecar != null) {
+            mSidecar.setListener(null);
+        }
+    }
+
     private void startIconAnimation() {
         mIconAnimationDrawable.start();
     }