DB/Creature: Morakki can't accept both quests

sql/updates/world/2016_06_23_05_world.sql

@@ -0,0 +1,2 @@
+-- Make both quests 24812 & 24813 available to players: you must complete both quests to take next one, quest 24814.
+UPDATE `quest_template_addon` SET `ExclusiveGroup`= -24812 WHERE `id` IN (24812, 24813);