fix: pass on correct context during verification

[zepatrik]

Spans in tracing are not correctly nested because of this.

[codecov]

Codecov Report

Attention: Patch coverage is 53.65854% with 19 lines in your changes missing coverage. Please review.

Project coverage is 78.56%. Comparing base (2f8aaee) to head (6b0d7e9).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
selfservice/strategy/code/strategy_verification.go	55.55%	7 Missing and 9 partials ⚠️
selfservice/strategy/link/strategy_verification.go	40.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4151      +/-   ##
==========================================
- Coverage   78.59%   78.56%   -0.03%     
==========================================
  Files         379      379              
  Lines       26988    27031      +43     
==========================================
+ Hits        21210    21237      +27     
- Misses       4166     4181      +15     
- Partials     1612     1613       +1     

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