[ISSUE #6390] Add break to the exception of WHEEL_TIMER_NOT_ENABLE. (#6394)

Author: GenerousMan

broker/src/main/java/org/apache/rocketmq/broker/processor/SendMessageProcessor.java

@@ -398,6 +398,7 @@ private RemotingCommand handlePutMessageResult(PutMessageResult putMessageResult
                 response.setCode(ResponseCode.SYSTEM_ERROR);
                 response.setRemark(String.format("accurate timer message is not enabled, timerWheelEnable is %s",
                      this.brokerController.getMessageStoreConfig().isTimerWheelEnable()));
+                break;
             case SERVICE_NOT_AVAILABLE:
                 response.setCode(ResponseCode.SERVICE_NOT_AVAILABLE);
                 response.setRemark(