Rename "recycle" notification to "recycled".

When the MQTT Publish QOS was set to 1: At least once, it could result in a recycle loop due the message being received by the recycle subscription, which was then interpreted as a request to recycle instead of a notification that a recycle has taken place. After this change "recycle" is used to request a recycle and "recycled" is used to notify that a recycle has taken place.

Related to !320 (merged)

src/sbbs3/mqtt.c

@@ -482,7 +482,7 @@ static void mqtt_connect_callback(struct mosquitto* mosq, void* cbdata, int rc)
 			mqtt_subscribe(mqtt, TOPIC_BBS, str, sizeof(str), "exec");
 			mqtt_subscribe(mqtt, TOPIC_BBS, str, sizeof(str), "call");
 		}
-		mqtt_pub_noval(mqtt, TOPIC_SERVER, "recycle");
+		mqtt_pub_noval(mqtt, TOPIC_SERVER, "recycled");
 		mqtt_pub_noval(mqtt, TOPIC_SERVER, "client");
 		mqtt_subscribe(mqtt, TOPIC_SERVER, str, sizeof(str), "recycle");
 		mqtt_subscribe(mqtt, TOPIC_HOST, str, sizeof(str), "recycle");