navigator: reset reached flag, not reached seq

It doesn't make sense to reset the reached sequence, especially not to
false since it's an int.

src/modules/navigator/navigator_main.cpp

@@ -933,7 +933,7 @@ Navigator::publish_mission_result()
 	//_mission_result.seq_current = 0;
 
 	/* reset some of the flags */
-	_mission_result.seq_reached = false;
+	_mission_result.reached = false;
 	_mission_result.item_do_jump_changed = false;
 	_mission_result.item_changed_index = 0;
 	_mission_result.item_do_jump_remaining = 0;