Twenty Twenty: Remove unnecessary escaping of `get_the_title()` in `comments.php`.

For users with the `unfiltered_html` capability, titles can contain legitimate markup.

The title is filtered on saving, so the content in the database is considered safe.

Props kjellr, joyously, peterwilsoncc.
Fixes #49190.
Built from https://develop.svn.wordpress.org/trunk@47110


git-svn-id: https://core.svn.wordpress.org/trunk@46910 1a063a9b-81f0-0310-95a4-ce76da25c4cd