修复druid最新版本数据监控页面刷新后空白问题

ruoyi-admin/src/main/java/com/ruoyi/web/controller/monitor/DruidController.java

@@ -21,6 +21,6 @@ public class DruidController extends BaseController
     @GetMapping()
     public String index()
     {
-        return redirect(prefix + "/index");
+        return redirect(prefix + "/index.html");
     }
 }