use correct severity level for waypoint reached event

src/uas/UAS.cc

@@ -1219,7 +1219,7 @@ void UAS::receiveMessage(LinkInterface* link, mavlink_message_t message)
             waypointManager.handleWaypointReached(message.sysid, message.compid, &wpr);
             QString text = QString("System %1 reached waypoint %2").arg(getUASName()).arg(wpr.seq);
             GAudioOutput::instance()->say(text);
-            emit textMessageReceived(message.sysid, message.compid, 0, text);
+            emit textMessageReceived(message.sysid, message.compid, MAV_SEVERITY_INFO, text);
         }
             break;