Changes: remove non-existing styling attribute
Changes: remove non-existing styling attribute

RevBy: Ning Chi

KDE/plasma-maliit-plugins,RHawkeyed/plugins,develersrl/maliit-demo-qml,RHawkeyed/plugins,maliit/plugins,KDE/plasma-maliit-plugins,develersrl/maliit-demo-qml,RHawkeyed/plugins,KDE/plasma-maliit-plugins,develersrl/maliit-demo-qml,maliit/plugins,maliit/plugins,develersrl/maliit-demo-qml,RHawkeyed/plugins,KDE/plasma-maliit-plugins,RHawkeyed/plugins,maliit/plugins