fix(vocd): 恢复导出和打开菜单项的显示状态

之前注释掉的导出和打开菜单项现在恢复显示，但默认设置为隐藏状态

vocd.html

@@ -338,12 +338,12 @@
       </div>
       <div class="menu-divider"></div>
       <div class="menu-item-text">
-        <!-- <div class="menu-item__export" title="导出">
+        <div class="menu-item__export" style="display: none;" title="导出">
           <span>导出</span>
         </div>
-        <div class="menu-item__open" title="打开">
+        <div class="menu-item__open" style="display: none;" title="打开">
           <span>打开</span>
-        </div> -->
+        </div>
         <div class="menu-item__save" title="保存">
           <span>保存</span>
         </div>