tests/get/file: Use @go.native_file_path_or_url
tests/get/file: Use @go.native_file_path_or_url

This fixes test breakages on Git for Windows due to the fact that `./go
get` now uses `@go.native_file_path_or_url` instead of its own
heuristic, which results in some file paths and URLs from the tests
getting translated that weren't before.

mbland/go-script-bash