Twenty Seventeen: Correct the number of recent posts in a comment in...

Twenty Seventeen: Correct the number of recent posts in a comment in `template-parts/page/content-front-page-panels.php`.

Props skostadinov, marcelo2605.
Fixes #42621.
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git-svn-id: https://core.svn.wordpress.org/trunk@42177 1a063a9b-81f0-0310-95a4-ce76da25c4cd