kwineffects: Add parent argument to Effect

src/libkwineffects/kwineffects.cpp

@@ -530,7 +530,8 @@ EffectScreen *ScreenPaintData::screen() const
 // Effect
 //****************************************
 
-Effect::Effect()
+Effect::Effect(QObject *parent)
+    : QObject(parent)
 {
 }
 

src/libkwineffects/kwineffects.h

@@ -362,7 +362,7 @@ public:
      * In OpenGL based compositing, the frameworks ensures that the context is current
      * when the Effect is constructed.
      */
-    Effect();
+    Effect(QObject *parent = nullptr);
     /**
      * Destructs the Effect object.
      *