qml folderview can't filter folders by name

I am not affiliated with this thread but it explains what:

https://www.qtcentre.org/threads/67822-QML-FolderListModel-how-to-set-nameFilters-for-directory-with-Script

Attached is a patch that implements that functionality and works for me. Feel free to include it into Qt royalty free from me and put in under whomever's copyright you want, with the only requirement that this should be always available under LGPL.