ghacks-clear-[removed].js : Fix JS syntax (#460)

* Fix syntax

* updated 06-July-2018

scratchpad-scripts/ghacks-clear-[removed].js

@@ -1,7 +1,7 @@
 /***
  This will reset the preferences that have been removed completely from the ghacks user.js.
 
- Last updated: 03-Jun-2018
+ Last updated: 06-July-2018
 
  For instructions see:
  https://github.com/ghacksuserjs/ghacks-user.js/wiki/3.1-Resetting-Inactive-Prefs-[Scripts]
@@ -90,7 +90,7 @@
     'browser.laterrun.enabled',
     'browser.offline-apps.notify',
     'browser.rights.3.shown',
-    'browser.slowStartup.maxSamples'
+    'browser.slowStartup.maxSamples',
     'browser.slowStartup.notificationDisabled',
     'browser.slowStartup.samples',
     'browser.storageManager.enabled',