Description of problem:
In Bugzilla 5, the CC list has changed from a plain list widget to a Selectize drop-down.

When not focused, the drop-down appears to be empty.  It should not be necessary for the user to open the drop-down and scroll it to see who is on the CC list.  Selectize is probably not the right choice of widget here.

Version-Release number of selected component (if applicable):
5.0.3

How reproducible:
Always

Steps to Reproduce:
1. View a bug that has a non-empty CC list.
2. Click the 'edit' link next to the CC list.

Actual results:
After step 2, there is an unlabelled and blank drop-down widget below the 'Add' input box.

Expected results:
The CC list is shown as a plain list widget, as in Bugzilla 4.

(I also considered the possibility of the unexpanded drop-down displaying the cc list like the Component drop-down does, but that seems like a bad idea to me, as the CC List widget also doubles as a selector for the users to be removed from CC.)

Additional info:
none