message: fix(GUI): Fix update notification error
  Remove "this" and use "exports" instead
  Change-type: patch
  Changelog-entry: Fix update notifier error popping up on v1.4.1->1.4.8
diff: @@ -79,7 +79,7 @@ exports.shouldCheckForUpdates = (options) => {
  return true
  }
  - return Date.now() - options.lastSleptUpdateNotifier > units.daysToMilliseconds(this.UPDATE_NOTIFIER_SLEEP_DAYS)
  + return Date.now() - options.lastSleptUpdateNotifier > units.daysToMilliseconds(exports.UPDATE_NOTIFIER_SLEEP_DAYS)
  }
  /**
  @@ -117,7 +117,7 @@ exports.notify = (version, options = {}) => {
  if (_.get(options, [ 'allowSleepUpdateCheck' ], true)) {
  _.merge(dialogOptions, {
  - checkboxLabel: `Remind me again in ${this.UPDATE_NOTIFIER_SLEEP_DAYS} days`,
  + checkboxLabel: `Remind me again in ${exports.UPDATE_NOTIFIER_SLEEP_DAYS} days`,
  checkboxChecked: false
  })
  }
  