Write queue after connect windows

The indentation could be simplified if it were just:
```c
if (handle->handle != INVALID_HANDLE_VALUE) {
  req->bufs = (uv_buf_t*) bufs;
  return uv_buf_write_impl_req(req);
}
```
Then the rest could be flattened.

Though I'm not understanding the use of `INVALID_HANDLE_VALUE` here. Since `uv_pipe_write_impl_req` must be called if the "pipe [was] initialized with ipc == 1".