Fix Thor.basename method

[zzaakiirr]

Looks like it actually comes from Ruby: https://stackoverflow.com/questions/37101151/what-does-file-program-name-mean-in-ruby

I don't think we should modify this variable. And this change only affects the specs, so we're not really testing anything. If anyone were to call the CLI from a file with a different name, they'd get the file name:

So I'd rather revert this and maybe figure out a way to fix it everywhere in a separate PR. Someone opened an issue about it on Thor a while ago, but it hasn't been touched: rails/thor#742

Maybe we could override basename from Thor to ensure it's always equal to package_name?

Originally posted by @rafaelgomesxyz in #221 (comment)