Stop dragging effect for wordpress metabox without any kinds of plugins!!

At first take my salam. hope all of you are very fine. when we visit our wordpress sites dashboard, then we see some meta box and if you want you can change place with mouse drugging. like that:

if you want then you can stop this dragging effect for meta box. for this work follow bellow steps:
1. First go to your admin panel.
2. Now select edit for current usage themes.
3. Now select ‘functions.php’file.
4. Now copy bellow code and paste in your themes 'functions.php' file and save it

function disable_drag_metabox() {
wp_deregister_script('postbox');
}
add_action( 'admin_init', 'disable_drag_metabox' );

 PROBLEM COPY CODE? TRY HERE!!
 Now try to drag your metabox. i am sure you are not able to drag meta box.