Replace CopyFileJob with a two-liner call to QFile::copy
Summary:
This isn't an async job.
A s/toString()/toLocalFile()/ bugfix along the way.
I can't trigger this code path from the widgets version, though.
Images are saved from pixmap, and files are saved after a download
(they are not in cache).
Reviewers: kfunk, mlaurent
Differential Revision: https://phabricator.kde.org/D27226