On display disconnect, only go to COLLECTION for current item
On display disconnect, only go to COLLECTION for current item

If the display was still around due to e.g. keeping it alive
for usb device redirection we don't want to go to collection view
if another machine is showing.

https://bugzilla.gnome.org/show_bug.cgi?id=688717

vbenes/gnome-boxes,vbenes/gnome-boxes