Fix mismatch between selected iteration and visually indicated realization selected

[andreas-el]

Issue
Resolves #9498

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.87%. Comparing base (1875f3b) to head (6dcfda8).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9547      +/-   ##
==========================================
+ Coverage   91.85%   91.87%   +0.01%     
==========================================
  Files         433      433              
  Lines       26768    26772       +4     
==========================================
+ Hits        24589    24596       +7     
+ Misses       2179     2176       -3     

Flag	Coverage Δ
cli-tests	39.76% <16.66%> (-0.02%)	⬇️
everest-models-test	34.66% <0.00%> (-0.01%)	⬇️
gui-tests	72.16% <100.00%> (+0.01%)	⬆️
integration-test	37.20% <0.00%> (-0.04%)	⬇️
performance-tests	52.01% <100.00%> (+0.04%)	⬆️
test	40.47% <0.00%> (+0.01%)	⬆️
unit-tests	74.15% <100.00%> (+<0.01%)	⬆️

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[berland]

lgtm!