Cleanup

* removed commented out cruft
* added tabIndex prop to delete button (with default=0)
* the last change also required a change to the sprite selector test snapshot

src/components/delete-button/delete-button.css

@@ -17,11 +17,6 @@
 
 }
 
-/* .delete-button.large:hover {
-    transform: scale(1.1, 1.1);
-    box-shadow: 0 0 0 4px $ui-black-transparent;
-} */
-
 .delete-button-visible {
   display: flex;
   align-items: center;