Tutorial for pak128 is not updated

[Yona-TYT]

The version of the tutorial that is on github is no longer compatible with recent versions of pak128.

Anyone with access to the repo who can help me?.

[Roboron]

Open a PR and I will merge it.

[Yona-TYT]

Looks like I was able to do it myself

https://github.com/simutrans/pak128/commit/9ce597779be45ba3ee1e8452244db9df68df5bdc