GenericScriptedConfigFactory::create: Do not use plugin keyword to identify which KCM should be loaded

We can just put the parameter in the variant list. Because the method is virtual, the keyword
parameter must exist in the method definition.

Task: https://phabricator.kde.org/T14744

src/kcmkwin/common/effectsmodel.cpp

@@ -625,7 +625,7 @@ static KCModule *findScriptedConfig(const QString &pluginId, QObject *parent)
         return nullptr;
     }
 
-    return factory->create<KCModule>(pluginId, parent);
+    return factory->create<KCModule>(parent, QVariantList{pluginId});
 }
 
 void EffectsModel::requestConfigure(const QModelIndex &index, QWindow *transientParent)

src/scripting/genericscriptedconfig.cpp

@@ -29,10 +29,14 @@ QObject *GenericScriptedConfigFactory::create(const char *iface, QWidget *parent
 {
     Q_UNUSED(iface)
     Q_UNUSED(parent)
-    if (keyword.startsWith(QLatin1String("kwin4_effect_"))) {
-        return new ScriptedEffectConfig(keyword, parentWidget, args);
+    Q_UNUSED(keyword)
+    Q_ASSERT(!args.isEmpty());
+
+    const QString pluginId = args.first().toString();
+    if (pluginId.startsWith(QLatin1String("kwin4_effect_"))) {
+        return new ScriptedEffectConfig(pluginId, parentWidget, args);
     } else {
-        return new ScriptingConfig(keyword, parentWidget, args);
+        return new ScriptingConfig(pluginId, parentWidget, args);
     }
 }