Wilderness is not kept inside the main save anymore, making saving faster

git-svn-id: http://svn.net-core.org/repos/t-engine4@3776 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/zones/wilderness/zone.lua

@@ -27,7 +27,7 @@ return {
 --	all_remembered = true,
 --	all_lited = true,
 --	day_night = true,
-	persistent = "memory",
+	persistent = "zone",
 	ambient_music = "Remembrance.ogg",
 	wilderness = true,
 	wilderness_see_radius = 4,