Add CSS:

.action a.cf-table-delete
{
  display:none !important;
}

This will tell all cf-table-delete links to not display. You need the add the !important  tag because when the page re-draws if another row is added it'll recreate the table with inline styles which you need to ensure don't overwrite your style setting.

You can also do the same for a collection using this:

a.cf-collection-delete
{
  display:none !important;  
}