vnc: refresh lossy rect after a given timeout If an adaptive encoding has choosen to send a lossy update based on the result of vnc_update_freq(), then it should advertise it with vnc_sent_lossy_rect(). This will allow to automatically refresh this rect once it's static again. Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>