Remove and convert backslashes to resolve local deploy directory issues for window users

While scaffolding a fresh webapp through openmrs owa generator, it automatically adds a trailing backslash to the local owa folder path. Due to this, user experiences an immediate build failure.
The main aim is to remove the automatic addition of trailing backslashes.

Reference links :

https://github.com/psbrandt/generator-openmrs-owa/blob/master/app/index.js

https://github.com/psbrandt/generator-openmrs-owa/blob/master/app/templates/webpack.config.js