(dired): Remove `ls-lisp` advice

(dired): Remove `ls-lisp` advice

`ls-lisp` used to advise `dired` because `dired-insert-directory`
blindly used `insert-directory-program` (together with a shell)
in order to implement the "directory wildcard" expansion.

* lisp/dired.el (dired-insert-directory): Make the "directory wildcard"
code obey `files--use-insert-directory-program-p`, using
`file-expand-wildcards`.

* lisp/ls-lisp.el (ls-lisp--dired, ls-lisp-unload-function): Delete funs.
(dired): Don't advise any more.