Coding Standards: Revert the change to...

Coding Standards: Revert the change to `wp-includes/class-wp-xmlrpc-server.php` in [46684] to investigate unit test failures.

See #48255.
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git-svn-id: https://core.svn.wordpress.org/trunk@46486 1a063a9b-81f0-0310-95a4-ce76da25c4cd