Fix invalid handle for termsize in Windows

Closes #3937

Signed-off-by: Gerard Braad <me@gbraad.nl>

libmachine/ssh/client.go

@@ -201,7 +201,7 @@ func (client *NativeClient) OutputWithPty(command string) (string, error) {
 	defer closeConn(conn)
 	defer session.Close()
 
-	fd := int(os.Stdin.Fd())
+	fd := int(os.Stdout.Fd())
 
 	termWidth, termHeight, err := terminal.GetSize(fd)
 	if err != nil {