New ember-data serializers send data without a model key in the payload
by default, so instead of what API expects:
{
"hook": {
"id": 1,
"active": true
}
}
it would send:
{ "id": 1, "active": true }
Because of that we need to change how hooks are serialized.
Furthermore, API V2 returns just "result: true" after a successful
request to change a hook, so we need to return something meaningful from
the adapter's updateRecord in order to make ember-data happy.
