Add Pester output file parameters rather than replace existing parameters - Fixes #31

[ChrisLGardner]

Description

Fixes the issue found in #31 where the PassThru parameter was replaced by the output file parameters, causing builds to not fail when an output file is specified for use in CI pipelines.

Related Issue

31

How Has This Been Tested?

Ran through a few builds that both used an output file and no output file and behaviour was as it should be.

Types of changes

• [X] 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 change)

Checklist:

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [X] All new and existing tests passed.