With autodetect, extract single files archive in current dir
Summary: Treat single files archive as single folder archive basically.
Test Plan: ctest
Reviewers: Ark, elvisangelaccio, ngraham
Reviewed By: Ark, elvisangelaccio
Subscribers: kde-utils-devel
Tags: Ark
Differential Revision: https://phabricator.kde.org/D23693