Fix for setuptools installation

[niemsoen]

This fixes a bug when building the package as setuptools has had an update to use script_dir and install_scripts with an underscore instead of a dash (script-dir and install-scripts) now. Please see here for reference.

[joshnewans]

Thanks! I forget how, but I spotted your fork the other day and noticed your fix, I had meant to message and ask about getting a PR.

I'll merge it now and just assume it actually works. My experience with releasing ROS packages is very limited and I've been meaning for a while to properly make sure this package is available (and works!) on the foxy/galactic/humble/rolling repos, so this is a good opportunity for me to bump the version as well as get it on all the distros.

I probably won't get around to that for a week or two though.

[niemsoen]

Sure, happy to help and thanks for merging!