Fixes: Indicator issues.
Fixes: Indicator issues.

RevBy: Maliit
Details: Should disconnect/connect modifierStateChanged()
    signal when keyboard state (OnScreen, Hardware) is changed.

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