Fix whitelist reload after launching server ECFLOW-2057

[marcosbento]

Description

As per the PR title.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

🌦️ >> Documentation << 🌦️
https://sites.ecmwf.int/docs/dev-section/ecflow/pull-requests/PR-257

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.45283% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.13%. Comparing base (7a6ea61) to head (d10768e).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ibs/server/src/ecflow/server/ServerEnvironment.cpp	50.00%	3 Missing ⚠️
...foolproof/TestFoolproof.PasswordsAndWhiteLists.cpp	97.87%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #257      +/-   ##
===========================================
+ Coverage    49.09%   49.13%   +0.03%     
===========================================
  Files         1230     1230              
  Lines        96688    96734      +46     
  Branches     14867    14864       -3     
===========================================
+ Hits         47473    47533      +60     
+ Misses       49215    49201      -14     

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