find: Correct ls(1) equivalent command for -ls primary

After commit 3bfbb521fef5, -g stopped being a no-op. The -g hasn't
been required for equivalent output since 4.4BSD.

PR: 282901
Fixes: 3bfbb521 ls: Improve POSIX compatibility for -g and -n.

The ls(1) change hasn't been merged to stable/13, but the -g is still
a no-op on stable/13 so the updated docs here are still correct and
more future-proof.

(cherry picked from commit b4ede68c21c6c0277bc283c2bda35f3136e836b6)