Remove unneeded check for comic Dataengine being valid
We do not really care, if the metadata of the plugin is valid, as long as we can properly create the dataengine from it.
Test Plan: With plasma-frameworks master, and this on Plasma/5.24 based revision, the dataengine can properly be loaded.
When intenitionally exporting a defunct plugin:
class Dummy : public QObject
{
Q_OBJECT
public:
Dummy(QObject *parent, const QVariantList &args) {
}
};
K_PLUGIN_CLASS_WITH_JSON(Dummy, "plasma-dataengine-comic.json")
The applet does not crash.