CLI: fix videoById function

cli/examples/content/createVideo.json

@@ -8,7 +8,7 @@
     "title": "Title",
     "description": "Description",
     "video": 1,
-    "thumbnailPhoto": "1",
+    "thumbnailPhoto": 1,
     "duration": 10,
     "mediaPixelHeight": 20,
     "mediaPixelWidth": 50,

cli/src/Api.ts

@@ -526,7 +526,7 @@ export default class Api {
   }
 
   async videoById(videoId: number): Promise<Video | null> {
-    const exists = !!(await this._api.query.content.entityById.size(videoId)).toNumber()
+    const exists = !!(await this._api.query.content.videoById.size(videoId)).toNumber()
     return exists ? await this._api.query.content.videoById<Video>(videoId) : null
   }