Remove LNDMC_ALT_MAX

This should be replaced with the maximum geofence
altitude GF_MAX_VER_DIST. I'm not aware anyone is using
this functionality as is.

src/modules/navigator/rtl_mission_fast_reverse.cpp

@@ -126,12 +126,10 @@ void RtlMissionFastReverse::setActiveMissionItems()
 							       reinterpret_cast<uint8_t *>(&next_mission_item), sizeof(mission_item_s), MAX_DATAMAN_LOAD_WAIT);
 
 			if (success) {
-				mission_apply_limitation(next_mission_item);
 				mission_item_to_position_setpoint(next_mission_item, &pos_sp_triplet->next);
 			}
 		}
 
-		mission_apply_limitation(_mission_item);
 		mission_item_to_position_setpoint(_mission_item, &pos_sp_triplet->current);
 	}