Account keystore file is created in wrong directory

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On windows it was created on %USERDIR%\Application Data in root!

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match kf.flush(&default_path(), Some(addr)) {
    Ok(_) => futures::done(Ok(Value::String(addr.to_string()))).boxed(),
    Err(_) => futures::done(Err(JsonRpcError::internal_error())).boxed(),
}