Fix Ordered Task List Items

What does this MR do?

Fixes the visual bug that caused ordered task lists items to be rendered as unordered task list items.

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

No.

Why was this MR needed?

In the markdown editor (issues, merge requests etc.) a nested ordered task list is rendered as an unordered task list when at least one of its parents is an unordered task list.

https://gitlab.com/gitlab-org/gitlab-ce/issues/31483

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 #31483 (closed)