merge updatechecker into updater

src/cron.js

@@ -42,8 +42,7 @@ const appHealthMonitor = require('./apphealthmonitor.js'),
     safe = require('safetydance'),
     scheduler = require('./scheduler.js'),
     system = require('./system.js'),
-    updater = require('./updater.js'),
-    updateChecker = require('./updatechecker.js');
+    updater = require('./updater.js');
 
 const gJobs = {
     autoUpdater: null,
@@ -130,7 +129,7 @@ async function startJobs() {
     // this is run separately from the update itself so that the user can disable automatic updates but can still get a notification
     gJobs.updateCheckerJob = CronJob.from({
         cronTime: `00 ${minute} 1,5,9,13,17,21,23 * * *`,
-        onTick: async () => await safe(updateChecker.checkForUpdates({ stableOnly: true }), { debug }),
+        onTick: async () => await safe(updater.checkForUpdates({ stableOnly: true }), { debug }),
         start: true
     });