修改BUG：字典表配置项系统演示键值不正确 link #ITEI0

#Issue
https://gitee.com/LongbowEnterprise/dashboard/issues?id=ITEI0

Bootstrap.DataAccess/Dict.cs

@@ -168,6 +168,6 @@ namespace Bootstrap.DataAccess
         /// 获得 是否为演示系统 默认为 false 不是演示系统
         /// </summary>
         /// <returns></returns>
-        public bool RetrieveSystemModel() => LgbConvert.ReadValue(DictHelper.RetrieveDicts().FirstOrDefault(d => d.Category == "系统设置" && d.Name == "访问日志保留时长" && d.Define == 0)?.Code, "0") == "1";
+        public bool RetrieveSystemModel() => LgbConvert.ReadValue(DictHelper.RetrieveDicts().FirstOrDefault(d => d.Category == "系统设置" && d.Name == "演示系统" && d.Define == 0)?.Code, "0") == "1";
     }
 }