fix(xo-server/Redis#{add,update}): return complete record

Introduced by 32afd5c46

Fixes https://xcp-ng.org/forum/post/68664

The returned record should not be serialized and should contain the identifier.

packages/xo-server/src/collection/redis.mjs

@@ -190,6 +190,8 @@ export default class Redis extends Collection {
 
         await Promise.all(promises)
 
+        model = this._unserialize(model) ?? model
+        model.id = id
         return model
       })
     )