jquery.idle: don't allow the active handler to fire as a result of the user going idle

(imported from commit 28793228e50449b096dfe999a8cd17b7fa9e347e)

zephyr/static/third/jquery.idle/jquery.idle.js

@@ -68,6 +68,7 @@
     var createTimeout = function() {
       timerId = setTimeout(function(){
         idle = true;
+        cancel();
         settings.onIdle.call();
         if(settings.keepTracking){
           timerId = createTimeout(settings);