DB/Gameobject: Fix Karazhan opera event game objects

By lassdas, closes #13832

sql/updates/world/2015_01_01_00_world.sql

@@ -0,0 +1,3 @@
+-- Fix Karazhan opera event game objects 
+-- Interaction fix => Disable player interaction with Door and Curtain
+UPDATE `gameobject_template` SET `flags` = 16 WHERE `entry` IN (184278,184279,183932);