Update refresh-token-grant-type.js

[DataBender76]

Line 103 -> if (token.client.id !== client.id) to if (token.client.clientId !== client.clientId)

[FStefanni]

Hi,

I am checking whether to merge this pr into a fork of this project.
The proposed change does not look fine to me, since the client object seems to have a id member, and not a clientId member. Could you please provide a better explanation for the proposed change?

Thank you.
Regards.