navigator move parameters out of MissionBlock

- MissionBlock is an interface with > 10 implementations

src/modules/navigator/navigation.h

@@ -141,7 +141,6 @@ struct mission_item_s {
 			 force_heading : 1,				/**< heading needs to be reached */
 			 altitude_is_relative : 1,		/**< true if altitude is relative from start point	*/
 			 autocontinue : 1,				/**< true if next waypoint should follow after this one */
-			 disable_mc_yaw : 1,				/**< weathervane mode */
 			 vtol_back_transition : 1;		/**< part of the vtol back transition sequence */
 	};
 };