fix #233 - cors eats status message

[kwhitley]

Description

corsify was not transferring the status of Responses to the final CORS version.

Related Issue

233

Solution

Instead of recreating the response, we'll simply append CORS headers.

Type of Change (select one and follow subtasks)

• [ ] Documentation (README.md)
• [ ] Maintenance or repo-level work (e.g. linting, build, tests, refactoring, etc.)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
  • [ ] I have included test coverage
• [ ] Breaking change (fix or feature that would cause existing functionality/userland code to not work as expected)
  • [ ] Explain why a breaking change is necessary:
• [ ] This change requires (or is) a documentation update
  • [ ] I have added necessary local documentation (if appropriate)
  • [ ] I have added necessary itty.dev documentation (if appropriate)