scripting: Reload SceneEffect configuration when effect is reconfigured

This ensures that the SceneEffect uses new settings when KCM changes
them.

src/scripting/scriptedquicksceneeffect.cpp

@@ -27,6 +27,12 @@ ScriptedQuickSceneEffect::~ScriptedQuickSceneEffect()
 {
 }
 
+void ScriptedQuickSceneEffect::reconfigure(ReconfigureFlags flags)
+{
+    m_configLoader->load();
+    Q_EMIT m_configLoader->configChanged();
+}
+
 int ScriptedQuickSceneEffect::requestedEffectChainPosition() const
 {
     return m_requestedEffectChainPosition;

src/scripting/scriptedquicksceneeffect.h

@@ -64,6 +64,7 @@ public:
 
     void setMetaData(const KPluginMetaData &metaData);
 
+    void reconfigure(ReconfigureFlags flags) override;
     int requestedEffectChainPosition() const override;
 
     bool isVisible() const;