Bug 1039465 - [Contacts DataRefactor] Tweak global_contacts_data module ...

...and multi_contact
With the change above this would become:

```javascript
return getEntry(globalDsId).then(function success(entry) {
  entry = entry[0]; // getEntry returns an array now
  return MultiContact.getData({
    id: globalDsId,
    entryData: entry
  });
});
```