fix: dateunknown property

Author: jdegand

apps/angular/interop-rxjs-signal/src/app/photo.model.ts

@@ -10,7 +10,7 @@ export interface Photo {
  isfamily: number;
  datetaken: string;
  datetakengranularity: number;
- datetakenunknown: unknown;
+ datetakenunknown: string;
  ownername: string;
  tags: string;
  url_q: string;