ICU-22695 Fix gap in unit preferences

[younies]

Checklist

• Required: Issue filed: https://unicode-org.atlassian.net/browse/ICU-22695
• Required: The PR title must be prefixed with a JIRA Issue number.
• Required: The PR description must include the link to the Jira Issue, for example by completing the URL in the first checklist item
• Required: Each commit message must be prefixed with a JIRA Issue number.
• Issue accepted (done by Technical Committee after discussion)
• Tests included, if applicable
• API docs and/or User Guide docs changed or added, if applicable

[jira-pull-request-webhook]

Notice: the branch changed across the force-push!

• icu4c/source/test/intltest/units_test.cpp is no longer changed in the branch
• icu4c/source/test/testdata/cldr/units/unitsTest.txt is different

View Diff Across Force-Push

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[jira-pull-request-webhook]

Hooray! The files in the branch are the same across the force-push. 😃

~ Your Friendly Jira-GitHub PR Checker Bot

[jira-pull-request-webhook]

Hooray! The files in the branch are the same across the force-push. 😃

~ Your Friendly Jira-GitHub PR Checker Bot

[jira-pull-request-webhook]

Hooray! The files in the branch are the same across the force-push. 😃

~ Your Friendly Jira-GitHub PR Checker Bot

[markusicu]

@younies we are going to tag the ICU 75 branch today. It would be great if you could finish this for 75, targeting the branch.
@sffc @macchiati FYI