Only count top-level comments when calculating threaded pagination.

The change in [34535] did not properly account for threading.

See #13939, #11334.

git-svn-id: https://develop.svn.wordpress.org/trunk@34805 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/comment-functions.php

@@ -881,6 +881,7 @@ function get_page_of_comment( $comment_ID, $args = array() ) {
 		'fields'     => 'ids',
 		'count'      => true,
 		'status'     => 'approve',
+		'parent'     => 0,
 		'date_query' => array(
 			array(
 				'column' => "$wpdb->comments.comment_date_gmt",