message: Fix incorrect FiresidePostRealm fields
diff: import { Model } from '../../../model/model.service';
  import { Realm } from '../../../realm/realm-model';
  -import { FiresidePost } from '../post-model';
  export class FiresidePostRealm extends Model {
  - // TODO(realm-posting) double-check
  - fireside_post!: FiresidePost;
  + fireside_post_id!: number;
  realm!: Realm;
  added_on!: number;
  constructor(data: any = {}) {
  super(data);
  - if (data.fireside_post) {
  - this.fireside_post = new FiresidePost(data.fireside_post);
  - }
  -
  if (data.realm) {
  this.realm = new Realm(data.realm);
  }
  