Use list in media library when listallinfo is overkill

When the media library is not sorted by mtime and not in two column mode, there is no reason to use listallinfo/GetDirectoryRecursive, instead of list/GetList (as far as I can see).

Using list instead of listallinfo is desired because listallinfo may be slow, fetches a lot more data than necessary in this case and because the MPD reference says this about listallinfo:
> Do not use this command. Do not manage a client-side copy of MPD's database. That is fragile and adds huge overhead. It will break with large databases. Instead, query MPD whenever you need something.```