fix aldulting call does not send status callback when hhangup (#623)

lib/utils/place-outdial.js

@@ -415,6 +415,8 @@ class SingleDialer extends Emitter {
         this.accountInfo.account.webhook_secret);
       else app.notifier = {request: () => {}, close: () => {}};
     }
+    // Replace old application with new application.
+    this.application = app;
     const cs = new AdultingCallSession({
       logger: newLogger,
       singleDialer: this,