There is a remove link that only appears on mobile devices. You can update it to always show by removing a class from the link. Find the code:
<p class="eC_ItemRemove_Link max_tablet"><a href="#" onclick="waec_update('Remove','festival_classes_Quantity_165695418226391927',this);">Remove</a></p>
Then remove the "max_tablet" class. That will make the link always appear in the cart.