IAE Binding for SD-JWT VC is inconsistent with other definitions

[TimoGlastra]

The SD-JWT VC IAE binding defines:

the aud claim in the Key Binding JWT MUST be set to the derived Origin

The W3C IAE binding defines:

the aud claim value MUST be set to the Interactive Authorization Endpoint

I think this should all use the IAE endpoint instead of the derived origin If I understood recent changes correctly?

[jogu]

Oliver will incorporate fix into #695