Fix phonetic names not being saved for Exchange contacts

If the phonetic name does not have a short/long form
(i.e. an expansion button), then we need to call into the
superclass onFieldChanged() method as we did previous to
this CL: https://android-git.corp.google.com/g/#/c/150242/

Bug: 5703655
Change-Id: Ibb0545ab96a104457e09ee227f05aa34290a343c