Plasma Search KCM: Properly mark as changed

Properly mark as changed when the user checks or unchecks
a specific runner.

kcms/runners/kcm.cpp

@@ -75,7 +75,7 @@ SearchConfigModule::SearchConfigModule(QWidget* parent, const QVariantList& args
 
     m_pluginSelector = new KPluginSelector(this);
 
-    connect(m_pluginSelector, &KPluginSelector::changed, this, QOverload<bool>::of(&SearchConfigModule::changed));
+    connect(m_pluginSelector, &KPluginSelector::changed, this, [this] { markAsChanged(); });
     connect(m_pluginSelector, &KPluginSelector::defaulted, this, &KCModule::defaulted);
 
     layout->addLayout(headerLayout);