[kwineffects] Fix wrong object being passed as a QQuickItem* context
Without this patch the following warning is issued:
Could not convert argument 1 at
onTriggered@file:///usr/share/kpackage/kcms/kcm_kwin_effects/contents/ui/Effect.qml:129
onClicked@file:///usr/lib/qml/org/kde/kirigami.2/templates/SwipeListItem.qml:485
Passing incompatible arguments to C++ functions from JavaScript is dangerous and deprecated.
This will throw a JavaScript TypeError in future releases of Qt!