Only sort directory when necessary
Only sort directory when necessary

gitkaste/ncdu,ppetr/ncdu,sunny256/ncdu,guns/ncdu,ppetr/ncdu,piyo/ncdu,gitkaste/ncdu,rofl0r/ncdu,guns/ncdu,sunny256/ncdu,ppetr/ncdu,guns/ncdu,rofl0r/ncdu,FauxFaux/ncdu,FauxFaux/ncdu