fix(accordion): clean up spacing issues

[rise-erpelding]

Description

TBD

CSS-1260

How and where has this been tested?

Please tag yourself on the tests you've marked complete to confirm the tests have been run by someone other than the author.

Validation steps

Regression testing

Validate:

1. The documentation pages for at least two other components are still loading, including:

• The pages render correctly, are accessible, and are responsive.

2. If components have been modified, VRTs have been run on this branch:

• VRTs have been run and looked at.
• Any VRT changes have been accepted (by reviewer and/or PR author), or there are no changes.

Screenshots

To-do list

• I have read the contribution guidelines.
• I have updated relevant storybook stories and templates.
• I have tested these changes in Windows High Contrast mode.
• If my change impacts other components, I have tested to make sure they don't break.
• If my change impacts documentation, I have updated the documentation accordingly.
• ✨ This pull request is ready to merge. ✨

[github-actions]

📚 Branch preview

PR #4139 has been deployed to Azure Blob Storage: https://spectrumcss.z13.web.core.windows.net/pr-4139/index.html.

[github-actions]

File metrics

Summary

Total size: 1.43 MB^*

Package	Size	Minified	Gzipped
accordion	21.58 KB	20.71 KB	2.64 KB

accordion

Filename	Head	Minified	Gzipped	Compared to base
index.css	21.58 KB	20.71 KB	2.64 KB	🔴 ⬆ 0.17 KB
metadata.json	11.43 KB	-	-	🔴 ⬆ < 0.01 KB

* Size is the sum of all main files for packages in the library.
* An ASCII character in UTF-8 is 8 bits or 1 byte.

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Latest commit: 782a1aa

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