`rich-click` CLI for version `1.8.0dev1` breaks backwards compatibility in edge case

[dwreeves]

Long story, not worth describing in detail since nobody reads this other than me. But I have a weird setup where I alias dbt to run cli dbt, and cli dbt is a Click CLI that runs separate_venv/bin/rich-click dbt, except when it does this it tries to call cli dbt (newly introduced behavior, and incorrect) instead of separate_venv/bin/dbt (old behavior, and correct).