Move get_imported_keyboard to anonymous namespace.
Move get_imported_keyboard to anonymous namespace.

It does not need to be a method of KeyboardLoaderPrivate, because
it does not modify currently_shifted field anymore.

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