Bug 1015094 - [NFC][Contacts] Contact cannot updated via NFC more than twice r=jmcf

actually `afterSaveFn` is a pointer to `afterSave`, you could see that definition few lines above:
https://github.com/mozilla-b2g/gaia/pull/20389/files#diff-de63cc4ebeef5c697af966f183eb5349L701