fix: remove duplicated verifiable addresses assignment in selfservice/hooks/web_hook

[hailam]

This PR fixes a minor code redundancy by removing a duplicated assignment in selfservice/hooks/web_hook.go.

Specifically, the line id.VerifiableAddresses = hookResponse.Identity.VerifiableAddresses was being assigned twice, conditional on len(hookResponse.Identity.VerifiableAddresses) > 0. The second, identical block was redundant. Removing it ensures cleaner, more concise code without altering the existing logic or behavior.

This is a non-breaking change and purely a code quality improvement.

Related issue(s)

This is a fix for a previously unknown, minor code redundancy.

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

This is a small, straightforward code cleanup. No alternatives were considered as the goal was simply to remove the redundant code.

[CLAassistant]

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