If response has a header, written status code is ignored

[Aksem]

Describe the bug
If at least one header is written in response and then status code, e.g. 404, then provided status code is ignored and is always 200. Without header, status code is correct.

To Reproduce
Steps to reproduce the behavior:

1. Start socketify app with following implementation:

from socketify import App


def handler(response, req):
    response.write_header(
        "Access-Control-Allow-Origin", "*"
    )
    response.write_status(404)
    response.end("Not found")


app = App()
app.any("/*", handler)
app.listen(3000, lambda config: print("Listening on port http://localhost:%d now\n" % config.port))
app.run()

2. Send any request to localhost:3000
3. Check status code, it is 200 instead of expected 404.

Expected behavior
Status code 404.

Desktop (please complete the following information):

• OS: Linux

Additional context
Without response.write_header call, status code is 404 as expected.