DB/Gameobject: remove wrong "Greetings, $n" gossip from 256 questgiver gameobjects.

sql/updates/world/3.3.5/2016_10_07_02_world.sql

@@ -0,0 +1,2 @@
+--
+UPDATE `gameobject_template_addon` SET `flags`=`flags`|4 WHERE `entry` IN (SELECT `entry` FROM `gameobject_template` WHERE `type`=2 AND `data3`=0);