app: Use explicit transition for display->collection
app: Use explicit transition for display->collection

This fixes the issue of display actor ending-up at the top of item in
collection view at the end of display->collection animation when linked
against clutter 1.16.

https://bugzilla.gnome.org/show_bug.cgi?id=701969

vbenes/gnome-boxes,vbenes/gnome-boxes