The bash completion doesn't handle subcommands that have hyphens in them correctly.

ArgumentParser version: 1.5.0 and main
Swift version: N/A

Checklist

• If possible, I've reproduced the issue using the main branch of this package
• I've searched for existing GitHub issues

Steps to Reproduce

The unit tests have a subcommand and the generated bash completion doesn't actually work. So the tests already reproduce the issue if the bash completion is loaded.

Expected behavior

Subcommand completion should be correct.

Actual behavior

_base_test_sub-command: command not found