Namespace find_file result

Summary:
KCoreAddons uses the same name, which causes this to use the cached result
for the KCoreAddons find_file call, making this fail when KCoreAddons is
present.

Reviewers: apol

Reviewed By: apol

Subscribers: kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D19048