fix: add missing code discriminator in updateVerificationFlow

[jonas-jonas]

Related issue(s)

Fixes ory/sdk#260

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

[codecov]

Codecov Report

Merging #3213 (a820a9d) into master (03ef8bf) will not change coverage.
The diff coverage is 100.00%.

❗ Current head a820a9d differs from pull request most recent head 1779684. Consider uploading reports for the commit 1779684 to get more accurate results

@@           Coverage Diff           @@
##           master    #3213   +/-   ##
=======================================
  Coverage   77.94%   77.94%           
=======================================
  Files         320      320           
  Lines       20430    20430           
=======================================
  Hits        15924    15924           
  Misses       3303     3303           
  Partials     1203     1203           

Impacted Files	Coverage Δ
selfservice/strategy/code/strategy_verification.go	74.25% <100.00%> (ø)

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