Fix $SYS/broker/publish/messages/+ counters not being updated for QoS 1, 2

Closes #1968. Thanks to promahn.

ChangeLog.txt

@@ -1,3 +1,8 @@
+Broker:
+- Fix $SYS/broker/publish/messages/+ counters not being updated for QoS 1, 2
+  messages. Closes #1968.
+
+
 2.0.3 - 2020-12-17
 ==================
 

lib/packet_mosq.c

@@ -294,6 +294,8 @@ int packet__write(struct mosquitto *mosq)
 			mosquitto__free(packet);
 			return MOSQ_ERR_SUCCESS;
 #endif
+		}else if(((packet->command)&0xF0) == CMD_PUBLISH){
+			G_PUB_MSGS_SENT_INC(1);
 		}
 
 		/* Free data and reset values */