Signal/slot signatures were wrong. Correctly forward the screenChanged
signal. This removes the following warning for me when running a QML
containment in plasmoidviewer:
Object::connect: No such slot ContainmentInterface::screenChanged() in
/home/sebas/kdesvn/src/kde/kde-runtime/plasma/scriptengines/javascript/plasmoid/appletinterface.cpp:605
REVIEW:106936