Rewrite integration tests for reset-password-test component

# Problem

Currently, `tests/integration/components/password/reset-password-test.js` doesn't make full use of its page object by not defining a renderPage() function. To dry up the code, you can set a renderPage() function above the `moduleForComponent`, pass in the needed hbs selectors, and call renderPage() in each test.

## References
#1605

Open tests/integration/components/password/reset-password-test.js and inspect how each test currently renders the component. Define renderPage() above moduleForComponent with the needed hbs selectors, then use it in each test to remove duplicated setup. Done means the integration tests still pass with the page object handling rendering.

Scritto dal modello di indicizzazione a partire dal testo della issue.