[nemo-qml-plugin-dbus] Don't add the array size to the list of dbusArguments.

QScriptValue arrays carry the size as last element, when a iterator
is used the size is reported as a value.
Merge pull request #6 from nemomobile/vdv-devel

[nemo-qml-plugin-dbus] Don't add the array size to the list of dbusArguments