remove app update check interval

If there’s an update, this would redownload it every 6 hours until the
app is restarted. We could fix it, but let’s just simplify this:

App updates are checked for on app startup only.

config.js

@@ -11,7 +11,6 @@ module.exports = {
 
   AUTO_UPDATE_URL: 'https://webtorrent.io/app/updates?version=' + APP_VERSION,
   AUTO_UPDATE_CHECK_STARTUP_DELAY: 60 * 1000 /* 1 minute */,
-  AUTO_UPDATE_CHECK_INTERVAL: 6 * 60 * 60 * 1000 /* 6 hours */,
 
   CONFIG_PATH: applicationConfigPath('WebTorrent'),
   CONFIG_POSTER_PATH: path.join(applicationConfigPath('WebTorrent'), 'Posters'),

main/auto-updater.js

@@ -11,31 +11,21 @@ var autoUpdater = electron.autoUpdater
 
 function init () {
   autoUpdater.on('error', function (err) {
-    log.error('Auto update error', err.message || err)
+    log.error('App update error: ' + err.message || err)
   })
 
   autoUpdater.setFeedURL(config.AUTO_UPDATE_URL)
 
-  // TODO: remove
-  autoUpdater.checkForUpdates()
-
   /*
    * We always check for updates on app startup. To keep app startup fast, we delay this
    * first check so it happens when there is less going on.
    */
   setTimeout(() => autoUpdater.checkForUpdates(), config.AUTO_UPDATE_CHECK_STARTUP_DELAY)
 
-  /*
-   * After the first check for updates, we continually check for updates on a regular
-   * interval. This is to ensure that checks happen even when the app is left open for a
-   * long time.
-   */
-  setInterval(() => autoUpdater.checkForUpdates(), config.AUTO_UPDATE_CHECK_INTERVAL)
-
   autoUpdater.on('checking-for-update', () => log('Checking for app update'))
   autoUpdater.on('update-available', () => log('App update available'))
   autoUpdater.on('update-not-available', () => log('App update not available'))
-  autoUpdater.on('update-downloaded', function (e) {
-    log('App update downloaded', e)
+  autoUpdater.on('update-downloaded', function (e, releaseNotes, releaseName, releaseDate, updateURL) {
+    log('App update downloaded: ', releaseName, updateURL)
   })
 }