Local pack not working on Windows

[teyyubismayil]

When running render command with local pack, it is not working. Particularly it says that passed variable is not defined: "There is no variable named "VAR_NAME". An override file can only override a variable that was already declared in a primary configuration file."

This happens because pack name is not correctly parsed from path as path library is used which is considered for slash-separated paths.

[teyyubismayil]

Created merge request to fix it