Add owner in video channel page

shared/models/videos/video-channel.model.ts

@@ -1,13 +1,11 @@
 import { Actor } from '../actors/actor.model'
 import { Video } from './video.model'
+import { Account } from '../actors'
 
 export interface VideoChannel extends Actor {
   displayName: string
   description: string
   support: string
   isLocal: boolean
-  ownerAccount?: {
-    id: number
-    uuid: string
-  }
+  ownerAccount?: Account
 }