message: Use document ID rather than component ID for branch identifiication
diff: @@ -518,7 +518,7 @@ export class ComponentHost extends EventEmitter implements IComponentDeltaHandle
  objectStorage: localStorage,
  };
  - const origin = message.origin ? message.origin.id : this.id;
  + const origin = message.origin ? message.origin.id : this.documentId;
  const value = await this.loadChannel(
  attachMessage.id,
  attachMessage.type,
  