fix: Issue with slotted content rendering in pfe-accordion-header

[castastrophe]

Component updates: pfe-accordion

Regression in pfe-accordion rendering slotted content in the header region.

URL: https://patternflyelements.org/components/content-set/

Testing instructions

• Visit demo
  1. Validate that all accordion headers render with their text and not "undefined"
• Visit demo
  1. Resize one of the panels rendering as a tabset
  2. Validate that all accordion headers it uses now render with their text and not "undefined"

Browser requirements

Your component should work in all of the following environments:

• Latest Firefox (on Mac OS)
• Latest Chrome (on Mac OS)
• Latest Safari

Ready-for-merge Checklist

Check off items as they are completed. Feel free to delete items if they are not applicable.

• Expected files: all files in this pull request are related to one request or issue (no stragglers or scope-creep).
• Tests have been updated to cover these changes.
• Browser testing passed.
• Changelog updated (required for fix and feat changes).

Merging

Please squash when merging and ensure your commit message uses conventional commit formatting.

Be sure to share your updates with the [email protected] mailing list!

[netlify]

✔️ Deploy Preview for patternfly-elements ready!

🔨 Explore the source changes: a8fbafc

🔍 Inspect the deploy log: https://app.netlify.com/sites/patternfly-elements/deploys/610c303c27748500081dea5b

😎 Browse the preview: https://deploy-preview-1742--patternfly-elements.netlify.app

[heyMP]

LGTM!