ls: fix comparisons in version sorting and recursive mode

[Alonely0]

Version sorting was being fed the incorrect values, as it expected file names but got paths, breaking the special-casing logic. This at some point was actually the expected behavior, because we asserted it in the tests; when triaging the associated issue, I reproduced we were mismatched with GNU on my Ubuntu LTS machine, so I'm submitting the fix. Also fixes a similar sorting bug in --recursive, backported from 26db61c.

Fixes #12058.

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/seq/seq-epipe is no longer failing!
Note: The gnu test tests/cut/cut-huge-range is now being skipped but was previously passing.
Note: The gnu test tests/env/env-signal-handler was skipped on 'main' but is now failing.
Skip an intermittent issue tests/pr/bounded-memory (was skipped on 'main', now failing)

[Alonely0]

It seems bindgen broke in OpenBSD (it seems related to indexmap dep?), but it's unrelated to the PR. If we see it in further CI runs we should look into it.

[cakebaker]

Thanks!