Core/Spells: updated Seed of Corruption to Cataclysm and fixed aoe damage effect when killing a unit with it

sql/updates/world/custom/custom_2019_03_22_00_world.sql

@@ -0,0 +1,3 @@
+DELETE FROM `spell_script_names` WHERE `ScriptName`= 'spell_warl_seed_of_corruption';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(27243, 'spell_warl_seed_of_corruption');