DB/SAI: Clear param2 for Remove Aura

Clear exististing data in param2 for sai entries using smart_action 28 as these param was previously unused but some lines of sai still had this param > 0

sql/updates/world/2014_11_02_01_world.sql

@@ -0,0 +1 @@
+UPDATE `smart_scripts` SET `action_param2`=0 WHERE `action_type`=28 and `action_param2`>0;