timers: remove redundant code

Author: indutny

lib/timers.js

@@ -157,15 +157,8 @@ exports.enroll = function(item, msecs) {
 // it will reset its timeout.
 exports.active = function(item) {
   var msecs = item._idleTimeout;
-  if (msecs >= 0) {
-    var list = lists[msecs];
-    if (!list || L.isEmpty(list)) {
-      insert(item, msecs);
-    } else {
-      item._idleStart = Timer.now();
-      L.append(list, item);
-    }
-  }
+  if (msecs >= 0)
+    insert(item, msecs);
 };