Install the metapackage from the seed instead of just the session

nb: can't use the task as this isn't generated yet

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (2.209+unity8.2) UNRELEASED; urgency=medium
+
+  * Install the unity8 meta package instead of just the session
+
+ -- Iain Lane <iain@orangesquash.org.uk>  Mon, 12 May 2014 16:22:37 +0100
+
 livecd-rootfs (2.209+unity8.1) utopic; urgency=medium
 
   * Merge with Utopic. Remaining changes:

live-build/auto/config

@@ -194,7 +194,7 @@ case $PROJECT in
 
 	ubuntu-unity8)
 		add_task install minimal standard
-		add_package install unity8-desktop-session-x11
+		add_package install ubuntu-unity8
 		COMPONENTS='main restricted universe'
 		LIVE_TASK='ubuntu-live'
 	;;