refactor: fix appRootPath to run in main or preload process

[mrfelton]

Description:

fix appRootPath to run in main or preload process

Motivation and Context:

Fixes an issue that prevents that app from starting up in production mode yarn package

How Has This Been Tested?

• yarn dev
• yarn start
• yarn package

Types of changes:

Fix

Checklist:

• My code follows the code style of this project.
• I have reviewed and updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes where needed.
• All new and existing tests passed.
• My commits have been squashed into a concise set of changes.

[korhaliv]

Tested ACK 0e66fa6