Fix unit test for kfileplacesmodeltest
Test Plan: Run "kiofilewidgets-kfileplacesmodeltest" make sure that "testRemoteUrls" is passing
Reviewers: ngraham
Reviewed By: ngraham
Subscribers: bruns, ngraham, maximilianocuria, elvisangelaccio, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D13018