manifest: Add glade to -devel
manifest: Add glade to -devel

Since it's useful for developers.

vrutkovs/vrutkovs.github.io,GNOME/gnome-ostree,chergert/gnome-continuous,vrutkovs/vrutkovs.github.io,vrutkovs/vrutkovs.github.io,GNOME/gnome-ostree,GNOME/gnome-ostree,chergert/gnome-continuous,chergert/gnome-continuous