How can I modify the shipping rates in WooCommerce to ensure that when the cart total exceeds 5000 MAD, only the free shipping option is displayed, and the 50 MAD shipping option is hidden? I currently have two delivery options: one is 50 MAD, and the other is free when the cart total exceeds 5000 MAD. Can you provide a code snippet that achieves this? and i dont want to show adress picker just force the shipping method and hide the option to pick adress