Simplify note support check

Co-authored-by: Timothy Jacobs <[email protected]>

Author: t-hamano

src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php

@@ -2001,7 +2001,7 @@ private function check_post_type_supports_notes( $post_type ) {
 			return false;
 		}
 		foreach ( $supports['editor'] as $item ) {
-			if ( is_array( $item ) && isset( $item['notes'] ) && true === $item['notes'] ) {
+			if ( ! empty( $item['notes'] ) ) {
 				return true;
 			}
 		}