fix(test): assert absence of Return Home button

tests/cypress/specs/rate-limit.cy.js

@@ -34,7 +34,7 @@ describe("Rate limiting feature spec", () => {
             } else {
               expect(res.status).to.eq(FAIL_STATUS);
               expect(res.body).to.contain("nginx");
-              expect(res.body).not.to.contain("Cal-ITP");
+              expect(res.body).not.to.contain("Return home");
             }
           });
         }