schemas: Lower idle-delay to 300 seconds
schemas: Lower idle-delay to 300 seconds

From the overly long 600 seconds

https://bugzilla.gnome.org/show_bug.cgi?id=692075

Distrotech/gsettings-desktop-schemas,Distrotech/gsettings-desktop-schemas,GNOME/gsettings-desktop-schemas,GNOME/gsettings-desktop-schemas