Fix type mismatch

[Browsit]

Just pulled the master branch and got the error:

C:\Users\{owner}\IdeaProjects\Terra\buildSrc\src\main\kotlin\DistributionConfig.kt: (49, 39): Type mismatch: inferred type is Path! but URI! was expected

Resolves this and subsequent Path component should be '/' on Windows [10].

• [x] I am the original author of this code, and I am willing to release it under GPLv3.