4.13.2 de-bugging

[Janosch]

- When flying the B-24, using the lock tail wheel command gives a message, even when the plane doesn't have a tail wheel. This doesn't cause a catastrophe though, like with B-25.

- Not really a bug, but the quick scramble mission in map NGNB_9-43 has a flaw. If the player is on the Axis side, there's a covered box on the runway that lops off the right wing of a plane that spawns there when the plane tries to move. (the mission is NGNB_9-43BlueScramble00.mis).