Write queue after connect windows

> We set connect_req when we are connecting with IOCP, if we connect immediately, then the writable flag is set immediatel so we don't need to connect_req for this guard to kick in. That is what I am saying, we don't really need to touch connect_req if we succeed without iocp.

The writable flag is not set immediately. It's set after `uv_process_tcp_connect_req`is called, at the begining of each loop iteration.