fixed transport stats

transport/mqtt/src/main/java/org/thingsboard/server/mqtt/ThingsboardMqttTransportApplication.java

@@ -20,12 +20,14 @@ import org.springframework.boot.SpringBootConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.scheduling.annotation.EnableAsync;
+import org.springframework.scheduling.annotation.EnableScheduling;
 
 import java.util.Arrays;
 
 @SpringBootConfiguration
 @EnableAsync
 @EnableAutoConfiguration
+@EnableScheduling
 @ComponentScan({"org.thingsboard.server.mqtt", "org.thingsboard.server.common", "org.thingsboard.server.transport.mqtt", "org.thingsboard.server.queue", "org.thingsboard.server.cache"})
 public class ThingsboardMqttTransportApplication {