Fix Dangling Task List Item

What does this MR do?

Fixes the height of an empty task list item.

Are there points in the code the reviewer needs to double check?

No.

Why was this MR needed?

Create a task list and leave the last task blank, the rendered markdown includes an empty checkbox that sits on top of the "Last edited" text

#32070 (closed)

Screenshots (if relevant)

Before: , After:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #32070 (closed)