Disable IBus embed preedit text via dbus-send

dbus-send --bus="`ibus address`" --print-reply \
    --dest=org.freedesktop.IBus \
    /org/freedesktop/IBus \
    org.freedesktop.DBus.Properties.Set \
    string:org.freedesktop.IBus string:EmbedPreeditText variant:boolean:false

Over!