[web] Update ProductPage test

For waiting a bit to find the expected content

web/src/components/product/ProductPage.test.jsx

@@ -180,7 +180,7 @@ describe("when the services are busy", () => {
  installerRender(<ProductPage />);
 
  const selectButton = await screen.findByRole("button", { name: "Change product" });
- const registerButton = screen.getByRole("button", { name: "Register" });
+ const registerButton = await screen.findByRole("button", { name: "Register" });
 
  expect(selectButton).toHaveAttribute("disabled");
  expect(registerButton).toHaveAttribute("disabled");