fix(ext-org): indent after description list terms

[wohanley]

Updated the list bullet regex in doom-themes-enable-org-fontification to match list items with description terms.

Before:

After:

---

• [x] I searched the issue tracker and this hasn't been PRed before.
• [x] My changes are not on the do-not-PR list for this project.
• [x] My commits conform to Doom's git conventions.
• [ ] I am blindly checking these off.
• [ ] This PR contains AI-generated work.
• [x] Any relevant issues or PRs have been linked to.
• [ ] This a draft PR; I need more time to finish it.