Fix artifact duplication when golem picks them up

git-svn-id: http://svn.net-core.org/repos/t-engine4@2502 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/class/Actor.lua

@@ -1353,7 +1353,7 @@ function _M:onAddObject(o)
 	-- Achievement checks
 	if self.player then
 		if o.unique then
-			self:resolveSource():registerArtifactsPicked(o)
+			game.player:registerArtifactsPicked(o)
 		end
 		world:gainAchievement("DEUS_EX_MACHINA", self, o)
 	end