AP_GPS: fixed vertical velocity in Replay

fixed NavEKF use of velocity velocity

libraries/AP_GPS/AP_GPS.cpp

@@ -411,6 +411,7 @@ AP_GPS::setHIL(uint8_t instance, GPS_Status _status, uint64_t time_epoch_ms,
     istate.location = _location;
     istate.location.options = 0;
     istate.velocity = _velocity;
+    istate.have_vertical_velocity = true;
     istate.ground_speed = pythagorous2(istate.velocity.x, istate.velocity.y);
     istate.ground_course_cd = degrees(atan2f(istate.velocity.y, istate.velocity.x)) * 100UL;
     istate.hdop = hdop;