Enable DO_SET_SPEED commands outside of missions in other AUTO modes (#18834)

* Navigator: enable DO_CHANGE_SPEED for outside of mission
- update _mission_cruising_speed_mc/_fw also if DO_CHANGE_SPEED command
is received outside of mission (e.g. while Loitering doing an Orbit)
- if vehicle is in AUTO_LOITER when receiving the change speed, then immediately
apply it by doing a reposition without updating any other field than cruising_speed
and cruising_throttle
-when RTL is activated reset the cruising speed and throttle

* Navigator: reset cruise speed and throttle to default when VTOL-transitioning

Signed-off-by: Silvan Fuhrer <silvan@auterion.com>

src/modules/navigator/mission.cpp

@@ -96,11 +96,6 @@ void Mission::mission_init()
 void
 Mission::on_inactive()
 {
-	/* We need to reset the mission cruising speed, otherwise the
-	 * mission velocity which might have been set using mission items
-	 * is used for missions such as RTL. */
-	_navigator->set_cruising_speed();
-
 	// if we were executing an landing but have been inactive for 2 seconds, then make the landing invalid
 	// this prevents RTL to just continue at the current mission index
 	if (_navigator->getMissionLandingInProgress() && (hrt_absolute_time() - _time_mission_deactivated) > 2_s) {