use correct filepath
Summary:
Seems like someone forgot to consistently apply a change. Maybe the path
construction should be factored into a reusable lambda?
Test Plan:
Open Okular, open settings > configure Okular. Without the patch, you'll get a
"QFSFileEngine::open: No file name specified" warning, with the patch it
disappears. Note that there is also an unrelated "Illegal icon group: 7"
warning from KIconThemes, but I'm 99% certain that this is on KIconThemes doing
a bogus check in KIconEffect::apply, not on Okular
Reviewers: Okular, hetzenecker, aacid
Reviewed By: Okular, aacid
Subscribers: aacid, Okular
Tags: Okular
Differential Revision: https://phabricator.kde.org/D12001