Fix GitHub token validation string

[RayBB]

I tired to fix this but couldn't quite figure out how.

Expected Behavior

The token validator shows the correct error message

Current Behavior

It shows the variable name "INVALID_TOKEN_MESSAGE"

Can you reproduce this reliably?

yes

[github-actions]

Thank you very much for opening up this issue! I am currently a bit overwhelmed by the many requests that arrive each week, so please forgive me, if I fail to respond personally. I am still very likely to at least skim read your request and I'll probably try to fix all (real) bugs if possible and I will likely review every single PR being made (please, give me a heads up if you intent to do so) and I will try to work on popular requests (please upvote via thumbs up on the original issue) whenever possible, but trying to respond to every single issue over the last years has been kind of draining and I need to adjust my approach for this project to remain fun for me and to make any progress with actually coding new stuff. Thanks for your understanding!

[johannesjo]

Will be fixed with the next release