Do not treat filename in selection as URL
Summary:
KFileWidget::setSelection(QString &) accepts either absolute URLs
or relative paths. If the filename contains a :, it gets treated
as a URL and gets rejected. This forces setSelection to parse
it as URL.
CCBUG: 376365
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D4579