Change the window title to be the Screen index
Change the window title to be the Screen index

$DISPLAY was not particularly useful and resulted in a crash for long
values of $DISPLAY.

Signed-off-by: Jeremy Huddleston <db3cec0cba09acb9cf8fd8bd399a3b27498cf883@apple.com>
Reviewed-by: Jamey Sharp <167c1dcbbc9c320e8e02a0c15c886204b4e658a4@minilop.net>

lbssousa/xf86-video-nested,lbssousa/xf86-video-nested,freedesktop-unofficial-mirror/xorg__driver__xf86-video-nested,oiteam/xf86-video-nested,freedesktop-unofficial-mirror/xorg__driver__xf86-video-nested,oiteam/xserver-xorg-video-nested,oiteam/xserver-xorg-video-nested,oiteam/xf86-video-nested-v1,oiteam/xf86-video-nested,oiteam/xf86-video-nested-v1