fuzz: avoid FuzzedSock::Recv() repeated errors with EAGAIN

If `recv(2)` returns an error (`-1`) and sets `errno` to a temporary
error like `EAGAIN` a proper application code is expected to retry the
operation.

If the fuzz data is exhausted, then `FuzzedSock::Recv()` will keep
returning `-1` and setting `errno` to the first element of
`recv_errnos[]` which happened to be `EAGAIN`. This may continue forever
or cause the fuzz test to run for a long time before some higher level
application "receive timeout" is triggered.

Thus, put `ECONNREFUSED` as first element of `recv_errnos[]`.

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