fix explore question

Author: shuzijun

src/main/java/com/shuzijun/leetcode/plugin/manager/ExploreManager.java

@@ -172,6 +172,7 @@ public static Question getItem(Question q) {
                     JSONObject question = object.getJSONObject(q.getLangSlug());
                     if(Constant.ITEM_TYPE_QUESTION.equals(q.getLangSlug())){
                         q.setQuestionId(question.getString("questionId"));
+                        q.setFrontendQuestionId(question.getString("questionId"));
                         q.setTitleSlug(question.getString("titleSlug"));
                     }else {
                         q.setNodeType(Constant.NODETYPE_DEF);

src/main/java/com/shuzijun/leetcode/plugin/manager/ViewManager.java

@@ -73,6 +73,9 @@ public String apply(Question question) {
             node.add(new DefaultMutableTreeNode(q));
         }
         for (String key : filter.keySet()) {
+            if(Constant.FIND_TYPE_CATEGORY.equals(key)){
+                continue;
+            }
             DefaultMutableTreeNode filterNode = new DefaultMutableTreeNode(new Question(key));
             root.add(filterNode);
             addChild(filterNode, filter.get(key), question);