Can't delete zone members in admin site

The delete button for zone members doesn't show up.  Repro steps:

1. Go to admin, configurations, zones
2. Create a new zone
3. select states, save
4. edit new zone, add two states, save
5. edit new zone, note that you can't delete the states

This fix will display the delete button for each member.  Formatting isn't great (perhaps someone else could fix that), but this fix at least restores the functionality.