message: fix: incorrectly handled client object in webhook constructor
diff: @@ -66,7 +66,10 @@ export class Webhook {
  this.applicationID = data.application_id
  if (rest !== undefined) this.rest = rest
  - else if (client !== undefined) this.rest = client.rest
  + else if (client !== undefined) {
  + this.client = client
  + this.rest = client.rest
  + }
  else this.rest = new RESTManager()
  }
  