Only add separator when base-path is not actual root

[eval]

Fixes #117
Please answer the following questions and leave the below in as part of your PR.

• This PR corresponds to an issue with a clear problem statement.

• This PR contains a test to prevent against future regressions

Writing to root-folder in a test seems not a great idea, and (match "/" "glob:some/path/some-file" {:recursive true}) would be time consuming... Other ideas?

• I have updated the CHANGELOG.md file with a description of the addressed issue.

[borkdude]

Thanks! Can you explain the fix? It's been a while since I worked on this code... 😓

[borkdude]

oh I think I got it already, if you provide a root path that ends with the file separator, there is no need to add it.

[borkdude]

Thanks!