KRun QML proxy: fix path/URL confusion
Summary:
I'm assuming the QString argument is always a complete URL.
The only two users of this code are in extragear/base/plasma-mobile and
they pass something called url.
Test Plan: Not tested, other than building.
Reviewers: davidedmundson, apol
Reviewed By: apol
Subscribers: apol, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D22586