webadmin: Enable editing WAD when VM is running

Fixed the regression introduced by
Ib8b9f2860fd186651311814d0087c47f4083c863.

Change-Id: Id59348e04ca25d8684716d59ed14a07561efbc7e
Bug-Url: https://bugzilla.redhat.com/1070823
Signed-off-by: Allon Mureinik <amureini@redhat.com>