Coding Standards: Remove superfluous blank lines at the end of various files.

Note: This is enforced by WPCS 3.0.0.

Props jrf.
See #59161, #58831.

git-svn-id: https://develop.svn.wordpress.org/trunk@56536 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/wp-mail-real-test.php

@@ -82,4 +82,3 @@ $to        = 'To <wp.mail.testing+to@gmail.com>';
 $headers[] = "BCC: {$bcc}";
 wp_mail( '', $subject, $message, $headers );
 echo "Test emails sent!\n";
-