create-app: update e2e test in app template

packages/create-app/templates/default-app/packages/app/cypress/integration/app.js

@@ -1,8 +1,6 @@
 describe('App', () => {
-  it('should render the welcome page', () => {
+  it('should render the catalog', () => {
     cy.visit('/');
-    cy.contains('Welcome to Backstage');
-    cy.contains('Getting Started');
-    cy.contains('Quick Links');
+    cy.contains('Backstage Service Catalog');
   });
 });