fix `no_delay` setting in `net` (nagle's algorithm state not reported correctly)

[bunnie]

There's a small bug in smoltcp that was fixed in https://github.com/smoltcp-rs/smoltcp/commit/8090469c2a1456b87a3e277e5b2f2e34e4f7555b

Which prevents us from correctly reporting the state of nagle's algorithm.

This issue helps anyone who encounters this to know what's up, and to remind me to fix this once they tag out a new release.