[File Explorer Source Control Integration] Craftsmanship Bug Fixes

[ssparach]

Summary of the pull request

This PR fixes the background behind button labels in "Night Sky" theme and adjusts the padding between the settings card for repository root paths.

References and relevant issues

https://microsoft.visualstudio.com/OS/_workitems/edit/54238809/ https://microsoft.visualstudio.com/OS/_workitems/edit/54238904/

Detailed description of the pull request / Additional comments

Validation steps performed

Local Build Manual Validation of UI to ensure issues are resolved

PR checklist

• [ ] Closes #xxx
• [ ] Tests added/passed
• [ ] Documentation updated