fix peer id -> did uri in sdk

[chunningham]

Description

Pr #151 turned Peer IDs into dids in kepler but not in the SDK, as I forgot to stage a change. This pr fixes that. these changes should not affect any functionality even if kepler is deployed before this pr is merged and makes its way into all the clients.

Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Diligence Checklist

(Please delete options that are not relevant)

• This change requires a documentation update
• I have included unit tests
• I have updated and/or included new integration tests
• I have updated and/or included new end-to-end tests
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules