title: Fancytree doesn't collapse nodes that have expanded key set to false
body: <p>I have the following JSON tree structure:</p>
  
  <pre><code>[
      {
          "expanded":"false",
          "key":"_23",
          "title":"Politics",
          "data":{
              "id":"23",
              "name_en":"Politics",
              "description_en":"",
              "seo_title_en":"",
              "seo_description_en":"",
              "name_sr":"Politika",
              "description_sr":"",
              "seo_title_sr":"",
              "seo_description_sr":"",
              "slug_en":"politics",
              "slug_sr":"politika"
          },
          "children":[
              {
                  "key":"_24",
                  "title":"Domestic politics",
                  "data":{
                      "id":"24",
                      "name_en":"Domestic politics",
                      "description_en":"",
                      "seo_title_en":"",
                      "seo_description_en":"",
                      "name_sr":"Doma\u0107a politika",
                      "description_sr":"",
                      "seo_title_sr":"",
                      "seo_description_sr":"",
                      "slug_en":"domestic-politics",
                      "slug_sr":"domaca-politika"
                  }
              }
          ]
      },
      {
          "expanded":"false",
          "key":"_21",
          "title":"Sport",
          "data":{
              "id":"21",
              "name_en":"Sport",
              "description_en":"",
              "seo_title_en":"",
              "seo_description_en":"",
              "name_sr":"Sport",
              "description_sr":"",
              "seo_title_sr":"",
              "seo_description_sr":"",
              "slug_en":"sport",
              "slug_sr":"sport"
          },
          "children":[
              {
                  "key":"_22",
                  "title":"Football",
                  "data":{
                      "id":"22",
                      "name_en":"Football",
                      "description_en":"",
                      "seo_title_en":"",
                      "seo_description_en":"",
                      "name_sr":"Fudbla",
                      "description_sr":"",
                      "seo_title_sr":"",
                      "seo_description_sr":"",
                      "slug_en":"football",
                      "slug_sr":"fudbla"
                  }
              }
          ]
      }
  ]
  </code></pre>
  
  <p>As you see the two nodes at first level have expanded set to false. But those aren't shown collapsed in tree. </p>
  
  <p>I load tree from AJAX request. Here is the init code:</p>
  
  <pre><code>$("#news-categories-table").fancytree({
      icon: false,
      checkbox: false,
      titlesTabbable: true,
      source: {
          url: SITE_URL + "news_categories/get_tree",
          cache: false
      },
      extensions: ["table", "dnd"],
      table: {
          nodeColumnIdx: 1   // render node expander, icon, and title to this column (default: #0)
      },
      dnd: {
          autoExpandMS: 400,
          draggable: { // modify default jQuery draggable options
              zIndex: 1000,
              scroll: false,
              containment: "parent",
              revert: "invalid"
          },
          preventRecursiveMoves: true, // Prevent dropping nodes on own descendants
          preventVoidMoves: true, // Prevent dropping nodes 'before self', etc.
          dragStart: function(node, data) {
              return true;
          },
          dragEnter: function(node, data) {
              return true;
          },
          dragExpand: function(node, data) {
              return true;
          },
          dragOver: function(node, data) {
              return true;
          },
          dragLeave: function(node, data) {
              return true;
          },
          dragStop: function(node, data) {
              return true;
          },
          dragDrop: function(node, data) {
              data.otherNode.moveTo(node, data.hitMode);
          }
      },
      renderColumns: function(event, data) {
          var node = data.node,
              $tdList = $(node.tr).find("&gt;td");
  
          // td 1 value is edit icon
          $tdList.eq(0).html(node.data.id);
      }
  });
  </code></pre>
  
  <p>Can this be solved somehow? I used fancytree before, older versions this was not problem. Expanded false nodes, were collapsed upon loading tree. </p>
  
  <p>Here is the screenshot also.</p>
  
  <p><a href="https://i.stack.imgur.com/pwSSY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pwSSY.png" alt="Tree screenshot"></a></p>