Follow ndn::Scheduler API changes

Switch from ndn::EventId to ndn::scheduler::EventId
and simplify some code.

Refs: #4883
Change-Id: Ifbd3b00da441ca0a277900265f8f6e31fdcebf2a
diff --git a/src/nlsr.cpp b/src/nlsr.cpp
index 78e6d0c..4dc536a 100644
--- a/src/nlsr.cpp
+++ b/src/nlsr.cpp
@@ -1,5 +1,5 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
+/*
  * Copyright (c) 2014-2019,  The University of Memphis,
  *                           Regents of the University of California,
  *                           Arizona Board of Regents.
@@ -561,7 +561,7 @@
 {
   NLSR_LOG_DEBUG("Scheduling Dataset Fetch in " << m_confParam.getFaceDatasetFetchInterval());
 
-  m_scheduler.scheduleEvent(m_confParam.getFaceDatasetFetchInterval(),
+  m_scheduler.schedule(m_confParam.getFaceDatasetFetchInterval(),
     [this] {
       this->initializeFaces(
         [this] (const std::vector<ndn::nfd::FaceStatus>& faces) {