Fix not being able to select other realizations than 0 in run dialog

[larsevj]

See https://equinor.slack.com/archives/C01MCMWD075/p1732804737440049

• 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

[larsevj]

Struggling to write a test for this.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (0ba0626) to head (7deb66f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9391   +/-   ##
=======================================
  Coverage   91.86%   91.86%           
=======================================
  Files         433      433           
  Lines       26657    26658    +1     
=======================================
+ Hits        24488    24490    +2     
+ Misses       2169     2168    -1     

Flag	Coverage Δ
cli-tests	39.41% <0.00%> (-0.01%)	⬇️
everest-models-test	34.83% <0.00%> (-0.01%)	⬇️
gui-tests	72.37% <100.00%> (+0.03%)	⬆️
integration-test	37.13% <0.00%> (-0.03%)	⬇️
performance-tests	52.07% <100.00%> (-0.02%)	⬇️
test	40.52% <0.00%> (-0.01%)	⬇️
unit-tests	74.02% <100.00%> (+<0.01%)	⬆️

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[andreas-el]

💯