unix_term::terminal_size uses STDIN_FILENO for isatty instead of configured output

[tgolsson]

For example;

console/src/unix_term.rs

Lines 49 to 51 in 0567bdc

	if libc::isatty(libc::STDOUT_FILENO) != 1 {
	return None;
	}

Should likely use out.as_raw_fd() instead. I think the same issue might exist in a few other places in that file that don't currently take a Term at all.