fix(challenge29): fix imports #1339 (#1340)

Author: mathisvester

apps/testing/29-real-life-application/src/app/list/ticket.store.ts

@@ -3,8 +3,8 @@ import {
   ComponentStore,
   OnStateInit,
   OnStoreInit,
-  tapResponse,
 } from '@ngrx/component-store';
+import { tapResponse } from '@ngrx/operators';
 import { pipe } from 'rxjs';
 import { mergeMap, tap } from 'rxjs/operators';
 import { BackendService, Ticket, User } from '../backend.service';