fix: don't return 500 if active strategy is disabled

[jonas-jonas]

Fixes https://github.com/ory-corp/cloud/issues/4297

Related issue(s)

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 #3197 (27ae94a) into master (08a3447) will increase coverage by 0.03%.
The diff coverage is 63.63%.

❗ Current head 27ae94a differs from pull request most recent head c585218. Consider uploading reports for the commit c585218 to get more accurate results

@@            Coverage Diff             @@
##           master    #3197      +/-   ##
==========================================
+ Coverage   77.68%   77.72%   +0.03%     
==========================================
  Files         319      319              
  Lines       20162    20171       +9     
==========================================
+ Hits        15663    15678      +15     
+ Misses       3301     3295       -6     
  Partials     1198     1198              

Impacted Files	Coverage Δ
selfservice/flow/recovery/strategy.go	100.00% <ø> (+25.00%)	⬆️
selfservice/flow/recovery/handler.go	58.73% <20.00%> (-2.94%)	⬇️
driver/registry_default_recovery.go	100.00% <100.00%> (ø)
driver/registry_default_verification.go	92.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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