Remove extra blank line in subscription view

Remove an unnecessary blank line before the closing PHP tag in views/meta-box-subscription-update.php. Pure whitespace cleanup with no functional changes.

Author: remcotolsma

views/meta-box-subscription-update.php

@@ -52,7 +52,6 @@
 $post_author = get_post_field( 'post_author' );
 $post_author = empty( $post_author ) ? '-' : $post_author;
 
-
 ?>
 <input type="hidden" name="post_author_override" value="<?php echo esc_attr( $post_author ); ?>" />