fix: correct lang parameter condition in redirectToLogin

[Kori000]

Issue Description

In the redirectToLogin method, there's an error in the logic for passing the lang parameter. The current code binds the lang parameter to the existence of the state parameter:

...parameters?.state ? { lang: parameters.lang } : {},

This causes the lang parameter to be passed only when the state parameter exists, making it ineffective when passing only the lang parameter.

Fix

Modified the condition to make the lang parameter's transmission depend only on the existence of the lang parameter itself:

...parameters?.lang ? { lang: parameters.lang } : {},

With this change, the lang parameter will be correctly passed to the authorization URL regardless of whether the state parameter is provided.

[Kori000]

Hi @frankie567

Just a gentle follow-up on this PR. Could you please take a look when you have time? It's a small bug fix that might benefit other users.

Thank you for your time and the great project!