title: Icon of the notification is different
body: <p>I get a push notification from FCM. When my application is minimized or screen is locked, I see a title of notification : Here is your notification and different icon.</p>
  
  <p>How I can change this? This is my code and how I create and display a notification I don't have this:</p>
  
  <pre><code>private void createNotification( String messageBody) {
      Intent intent = new Intent( this , NotificationActivity. class );
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
      PendingIntent resultIntent = PendingIntent.getActivity( this , 0, intent, PendingIntent.FLAG_ONE_SHOT);
  
      Uri notificationSoundURI = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
      NotificationCompat.Builder mNotificationBuilder = new NotificationCompat.Builder( this)
              .setSmallIcon(R.mipmap.ic_launcher)
              .setContentTitle("Wiadomosc z serwera")
              .setContentText(messageBody)
              .setAutoCancel( true )
              .setSound(notificationSoundURI)
              .setContentIntent(resultIntent);
  
      NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
  
  
      notificationManager.notify(0, mNotificationBuilder.build());
  }
  </code></pre>