Removed cursor styling for spinners

Cursor styling is overridden by 'pointer-events: none' as the item
is no longer the target of mouse events, so the cursor will always
be default.

Change-Id: I672d590b1e1da5aabba12dfb77f4cc4bde71e4cd

openstack_dashboard/static/dashboard/scss/components/_spinners.scss

@@ -20,7 +20,6 @@
       .btn {
         @include opacity(.65);
         @include box-shadow(none);
-        cursor: $cursor-disabled;
         pointer-events: none;
       }
     }