Fix XDGV6 popup test
Summary:
We had a data funciton...then didn't use it, effectively skpping half of
the point of the test.
Test Plan: Ran the test
Reviewers: KWin, mart
Reviewed By: KWin, mart
Subscribers: romangg, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D13495