Component build process fails on Windows machine

[mrrossmullen]

Bug Report

• [x] I’ve read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I’ve read and agree to the Code of Conduct.
• [x] I’ve searched for any related issues and avoided creating a duplicate issue.

What happened

Running npm run build on a Windows machine causes the component build process to fail. Earlier fix #1001 causes this problem as the substring function trims the first character of the directory path.

What I expected to happen

A component is ready for publishing to npm within the directory /lib and no errors displayed.

Reproducing

• OS: Windows 10
• Module name: helper.js
• Module version: n/a
• Pancake version: n/a
• Node version: 14.15.4
• npm version: 6.14.10
• Pancake settings in your package.json: n/a

Steps to reproduce:

1. npm i
2. cd packages/<component directory>
3. npm run build