added gps as a multi-topic in the ekf replay topic list

src/modules/logger/logged_topics.cpp

@@ -158,7 +158,7 @@ void LoggedTopics::add_estimator_replay_topics()
 {
 	// for estimator replay (need to be at full rate)
 	add_topic("ekf2_timestamps");
-	add_topic("sensor_gps");
+	add_topic_multi("sensor_gps");
 
 	// current EKF2 subscriptions
 	add_topic("airspeed");