bugfix Update delete dashboard response message to success (#4133)

Signed-off-by: zhusaidong <zhusaidong@gmail.com>
Co-authored-by: Duansg <siguoduan@gmail.com>

Author: zhusaidong

hertzbeat-grafana/src/main/java/org/apache/hertzbeat/grafana/controller/DashboardController.java

@@ -102,6 +102,6 @@ public ResponseEntity<Message<String>> deleteDashboardByMonitorId(@RequestParam
             log.error("delete dashboard error", e);
             return ResponseEntity.ok(Message.fail(FAIL_CODE, "delete dashboard fail"));
         }
-        return ResponseEntity.ok(Message.fail(FAIL_CODE, "delete dashboard fail"));
+        return ResponseEntity.ok(Message.success("delete dashboard success"));
     }
 }