docs: Add destructuring to onRedirectCallback example to access state

[heatherfaerber]

Previously the Using State section of README showed an example accessing state object directly in onRedirectCallback:

<AuthKitProvider
      clientId="client_123"
      apiHostname="auth.example.com"
      onRedirectCallback={(state) => {
        // Access your data here
        if (state?.returnTo) {
          window.location.href = state.returnTo;
        }
      }}
    >

This correction shows state being destructured so it can be accessed:

<AuthKitProvider
      clientId="client_123"
      apiHostname="auth.example.com"
      onRedirectCallback={({ state }) => {
        // Access your data here
        if (state?.returnTo) {
          window.location.href = state.returnTo;
        }
      }}
    >

[greptile-apps]

PR Summary

Updates the onRedirectCallback example in README.md to correctly demonstrate state object destructuring from the callback parameter.

• Fixed misleading example in README.md that incorrectly showed direct state access, now properly shows destructuring { state } parameter in onRedirectCallback

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[nicknisi]

Thank you!