MONGOCRYPT-737 set status if mongocrypt_kms_ctx_fail called with retry disabled

[kevinAlbs]

Follow-up to 7aeaec4. Calling mongocrypt_kms_ctx_fail with retry disabled is expected to result in an error.

An early return in mongocrypt_kms_ctx_fail returns false to indicate error, but does not set the status:

if (!kms && !kms->retry_enabled) {
    return false;
}

This PR removes the !kms->retry_enabled condition to fall through to the intended error check below:

if (!kms->retry_enabled) {
    CLIENT_ERR("KMS request failed due to network error");
    return false;
}