TrappedChest's MaterialData should be org.bukkit.material.Chest

It's confusing that TrappedChests don't have `org.material.Chest` as `MaterialData`.
That is IMO a logical mistake and TrappedChests' facing direction can't be changed (by plugins).

This PR changes this without breaking any plugins/sever implementations/etc.
Re-add this line to make the diff even smaller :3