fix: redirect to verification URL even if login_challenge is set

[hperl]

Related issue(s)

ory/network#320

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

[Benehiko]

nice :)

[codecov]

Codecov Report

Merging #3412 (58bdc6d) into master (88237e2) will decrease coverage by 0.01%.
Report is 1 commits behind head on master.
The diff coverage is 88.23%.

❗ Current head 58bdc6d differs from pull request most recent head ca54f8c. Consider uploading reports for the commit ca54f8c to get more accurate results

@@            Coverage Diff             @@
##           master    #3412      +/-   ##
==========================================
- Coverage   78.02%   78.02%   -0.01%     
==========================================
  Files         327      327              
  Lines       21370    21379       +9     
==========================================
+ Hits        16673    16680       +7     
  Misses       3459     3459              
- Partials     1238     1240       +2     

Files Changed	Coverage Δ
selfservice/flow/registration/hook.go	71.33% <81.81%> (+0.41%)	⬆️
identity/credentials.go	83.78% <100.00%> (ø)
selfservice/hook/show_verification_ui.go	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes