Improving testcase

It turns out the test did not fill any values in the form, which was not as intended. Updated test so that it does.

frontend/src/routes/register/index.test.tsx

@@ -4,7 +4,6 @@ import userEvent from '@testing-library/user-event'
 import AdapterDateFns from '@mui/lab/AdapterDateFns'
 import { LocalizationProvider } from '@mui/lab'
 import Register from './index'
-import { act } from '@testing-library/react'
 
 // Mock react-i18next module to return a translation that just returns the key
 jest.mock('react-i18next', () => ({