Db/Disable: Sibling Rivalry credit

By @untaught fixes #11020

sql/updates/world/2013_10_13_00_world_disable.sql

@@ -0,0 +1,3 @@
+DELETE FROM `disables` WHERE `entry` =56940;
+INSERT INTO `disables` (`sourceType`, `entry`, `flags`, `params_0`, `params_1`, `comment`) VALUES
+(0,56940,64,'','','Disable LOS check for Thorim Story Kill Credit');