How to change the link of {image-1} in shortstory?

Question

DLE

Good afternoon.
Tell me how to change the link of the {image-1} tag in shortstory.tpl ?
I need
/uploads/posts/2019-08/1564931230_1cover.jpg
to become
/uploads/posts/2019-08/thumbs/1564931230_1cover.jpg
I found the code 2 times in the engine/modules/show.short.php file:

if( $value[12] AND file_exists(ROOT_DIR . "/uploads/posts/" .$path_parts['dirname']."/thumbs/".$path_parts['basename']) ) {
            $thumb_url = $config['http_home_url'] . "uploads/posts/" . $path_parts['dirname']."/thumbs/".$path_parts['basename'];
            $img_url = $config['http_home_url'] . "uploads/posts/" . $path_parts['dirname']."/".$path_parts['basename'];
          } else {
            $img_url = 	$config['http_home_url'] . "uploads/posts/" . $path_parts['dirname']."/".$path_parts['basename'];
            $thumb_url = "";
          }

$img_url replaced
$path_parts['dirname']."/".$path_parts
with
$path_parts['dirname']."/thumbs/".$path_parts
But for some reason this does not work.