Updated Clarity Maps

[setzeus]

Description

Updates two structs in the sbtc-registry contract to stored data already passed through.

Closes: #800

Changes

The 'sbtc-registry' Clarity smart contract

Testing Information

All unit tests effected are now updated.

Checklist:

• I have performed a self-review of my code
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[djordon]

Can we also update the get-withdrawal-request read only function to flatten out the return tuple. Right now the status is a tuple that also contains another status field, but I think we want

(merge request (map-get? withdrawal-status id))

right?