Remove unnecessary use of `MarkdownElementBuilder::flush_text` (#30376)

The next statement calls `modify_current_div` which immediately does
`flush_text`.

Release Notes:

- N/A
c58b6903b8Michael Sloan committed on 5/9/2025, 12:35:06 PM· committed by GitHubparent11b6ce4
1 file changedLine totals unavailable