Corrected logic

[pmaciel]

Description

Corrected the logic of a option switching to set/unset, as opposed to just unset.

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/eckit/pull-requests/PR-246

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.88%. Comparing base (eda7547) to head (32dd333).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #246      +/-   ##
===========================================
+ Coverage    65.86%   65.88%   +0.02%     
===========================================
  Files         1129     1129              
  Lines        57671    57670       -1     
  Branches      4365     4364       -1     
===========================================
+ Hits         37985    37996      +11     
+ Misses       19686    19674      -12     

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