Joplin logo is out dated

[laurent22]

Hi @peterbeck,

We've been in touch before but somehow I couldn't find how to contact you. I wanted to submit a pull request to update the Joplin logo but then I realised this repo is no longer maintained.

Basically, if possible, it would be good to use the latest Joplin icon which is available there at various sizes:

https://github.com/laurent22/joplin/tree/dev/Assets/LinuxIcons

If I can help with that please let me know.

[Maroko]

I've updated the icon in my PR for the maintained Joplin Choco Package: afischer211#18