DevTest: Change texture for node-aligned node

[Wuzzy2]

Fixes #12559.

[rubenwardy]

Missing license.txt update

[TurkeyMcMac]

Looks good except for the missing license notice.

[Wuzzy2]

Tbh, I don't think most images in DevTest even apply to copyright in the first place because they're trivial, especially those test nodes. There is a bunch of other textures in DevTest that I have created when I made the big DevTest rework. If you still want this to be documented, please say so and I make a separate PR for all these files at once.

[TurkeyMcMac]

Your choice.

[rubenwardy]

If you still want this to be documented, please say so and I make a separate PR for all these files at once.

Technically you should do, as the default license for Minetest is CC BY-SA requires attribution and it's hard to do that without knowledge of where the textures come from. But as you say, that doesn't matter for this PR

[Wuzzy2]

So is this an official request to create a 2nd PR or not?
But be warned: It will be a LONG list of files and all DevTest images I made were hastily scribbled together in seconds, those aren't works of art.

[rubenwardy]

I wouldn't worry about it unless someone complains. Maybe at most you could add a line like "Unless otherwise stated, devtest textures are by Wuzzy" but idk