EKF: Publish initial altitude estimate in any case

src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp

@@ -699,10 +699,9 @@ void AttitudePositionEstimatorEKF::task_main()
 					// Publish Local Position estimations
 					publishLocalPosition();
 
-					// Publish Global Position, but only if it's any good
-					if (_gpsIsGood || _global_pos.dead_reckoning) {
+					// Publish Global Position, it will have a large uncertainty
+					// set if only altitude is known
 					publishGlobalPosition();
-					}
 
 					// Publish wind estimates
 					if (hrt_elapsed_time(&_wind.timestamp) > 99000) {