Drop X-KDE-PluginInfo-Depends keys
The concept will be removed in KF6, see https://phabricator.kde.org/T13553. Also it is not needed in the tests, consequently there is no reason to keep it and we can remove the noise when searching for occurrences.
The concept will be removed in KF6, see https://phabricator.kde.org/T13553. Also it is not needed in the tests, consequently there is no reason to keep it and we can remove the noise when searching for occurrences.