Address @todo in claro_preprocess_fieldset__media_library_widget

Duran Goodyearrequested to merge
issue/drupal-3156739:3156739-fix-against-1145 into 10.1.x

By: alphex

Closes #3156739

There's a @todo in the docblock of \claro_preprocess_fieldset__media_library_widget that says:

@todo Remove this when https://www.drupal.org/project/drupal/issues/2999549 lands.

This was in ClaroHooks.php on line 1302

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