Fix: Update useAuth.ts

[dennismwas]

This pull request fixes an issue with the sign in options when calling the Sign in Method, the primaryOptions when set to 'credentials' the sigin payload results in the string being split to single characters.
Thiis fix adresses that issue.

Example showcase

  const res = await signIn('credentials', {
        email: '[email protected]',
        password: 'qwerty'
      });

[zoey-kaiser]

Hi @dennismwas 👋

Thank you for taking the time to look into this! However, I don't believe this is an issue with the code. The local and refresh providers do not take a first parameter, as you describe above.

signIn({
	email: '[email protected]',
	password: 'qwerty'
})

The credentials parameters refers to the object you are supposed to pass, not a string. The second object are the further options you would like to pass. Therefore if you were to "unspread" the first one and then passed a credentials object, these would not be passed to the fetch request correctly, therefore requiring developers to always pass a string first, which we would not even read here.