Fix enum mapping for heading size component
>>> [!note] Migrated issue
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<!-- Migrated from issue #3587490. -->
Reported by: [pameeela](https://www.drupal.org/user/1431110)
Related to !20
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The heading component size enum mapping is one value short. It needs a value for the default option.</p>
issue