fix incorrect variable name

js/tree.js

@@ -67,7 +67,7 @@
     // Settings generated by http://wwwendt.de/tech/fancytree/demo/sample-configurator.html
     $('#' + id).fancytree({
       extensions: ["persist"],
-      ctiveVisible: true, // Make sure, active nodes are visible (expanded).
+      activeVisible: true, // Make sure, active nodes are visible (expanded).
       aria: false, // Enable WAI-ARIA support.
       autoActivate: true, // Automatically activate a node when it is focused (using keys).
       autoCollapse: false, // Automatically collapse all siblings, when a node is expanded.