notification.

    Fixes PR 258868

    Fixes a bug in the framework where we sent down an object for the
    itemId as opposed to the id itself. This caused the notification
    framework to remove all notifications for the app.

    Additionally changed the default itemId string to work around a
    known issue in R9E where the prefix can be used to remove all items.

    Reviewed By: Nukul Bhasin <nbhasin@rim.com>
    Tested By: Tracy Li <tli@rim.com>