Resuse the original user principal to avoid crumb issues.

[jtnord]

as it has been observed that the case of a user may change during a refreesh flow even though they are the same user, the crumb uses the Authentications name (principal), which would be different as we use the returned value.
Rather than using the new value, after checking it is the same id (according to the ID Strategy) we use the original so that the crumb can be matched.

maybe fixes: #411

Testing done

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• Ensure that the pull request title represents the desired changelog entry
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[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 71.44%. Comparing base (0a76e5d) to head (0fdc550).
Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/org/jenkinsci/plugins/oic/OicSecurityRealm.java	14.28%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #426      +/-   ##
============================================
- Coverage     71.68%   71.44%   -0.25%     
- Complexity      202      206       +4     
============================================
  Files            16       16              
  Lines           890      907      +17     
  Branches        120      128       +8     
============================================
+ Hits            638      648      +10     
- Misses          188      191       +3     
- Partials         64       68       +4     

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[mikecirioli]

looking forward to see if this fixes some of the annoying errors i see in my browser logs :)