Fix Tart home folder path

[chandlerhuff]

Description

Fixing file paths for Tart home folder

Motivation and Context

Using a custom Tart home folder does not currently work.

Screenshots (if appropriate):

Using path() without path(percentEncoded: false) is causing paths with spaces to be percent encoded in the app UI:

Using absoluteString is causing the file path to have file:// which does not work so the VM never starts.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)