Remove whitespace side effects from comment_form().

Props timersys.
Fixes #30500.


git-svn-id: https://develop.svn.wordpress.org/trunk@31036 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/comment-template.php

@@ -2228,8 +2228,7 @@ function comment_form( $args = array(), $post_id = null ) {
 	 */
 	$args = wp_parse_args( $args, apply_filters( 'comment_form_defaults', $defaults ) );
 
-	?>
-		<?php if ( comments_open( $post_id ) ) : ?>
+		if ( comments_open( $post_id ) ) : ?>
 			<?php
 			/**
 			 * Fires before the comment form.