Use path-columns in result metadata hook

[ask4fusora]

Summary

• replace deprecatedmetadata set --datasource-l withmetadata set --path-columns [name in the result module display hook
• preserve path-aware rendering forl output while matching the current Nushell metadata API

Why

Nushell now warns that--datasource-l is deprecated and recommends--path-columns [name instead.

[fdncred]

Thanks

[Juhan280]

Hi. Sorry this is not correct as $meta.source == ls is also deprecated (we don't have a way to emit warnings for accessing fields).

I will try to make a PR later