fix getIDHref mock, it returns a string, not an observable

src/app/core/data/comcol-data.service.spec.ts

@@ -89,7 +89,7 @@ describe('ComColDataService', () => {
   function initMockCommunityDataService(): CommunityDataService {
     return jasmine.createSpyObj('responseCache', {
       getEndpoint: hot('--a-', { a: communitiesEndpoint }),
-      getIDHref: cold('b-', { b: communityEndpoint })
+      getIDHref: communityEndpoint
     });
   }