Added missing underscore in target_scripts path

[Akasurde]

• Without this project data files are not copied in the installation which are required.

[nitzmahone]

While testing this fix, it appears that this option is just ignored under almost all circumstances- the only way I could actually get it to break in a way where this option was actually consulted was when directly pip install ing a git clone with the .git dir removed. python -m build, and pip install with a GH ref archive or a functional git worktree all basically seem to ignore this option and package everything.

I don't see any harm to having it actually describe the right thing, but we may end up needing to go back to MANIFEST.in at some point anyway. 🤷‍♂️

Thanks!