Update S if S > N/2 instead return false

[imduchuyyy]

https://github.com/base-org/webauthn-sol/blob/619f20ab0f074fef41066ee4ab24849a913263b2/src/WebAuthn.sol#L110

When verify webauth signature. In case S value > _P256_N_DIV_2, library will return false. But we can Canonical S- value to preventing the creation of a second valid signature

        if (webAuthnAuth.s > _P256_N_DIV_2) {
            // guard against signature malleability
            webAuthnAuth.s = FCL_Elliptic_ZZ.n - webAuthnAuth.s;
            //return false;
        }