Core/Spells: fixed Whirlwind cooldown reduction when hitting 4 or more targets

sql/updates/world/custom/custom_2019_12_01_01_world.sql

@@ -0,0 +1,3 @@
+DELETE FROM `spell_script_names` WHERE `ScriptName`= 'spell_warr_whirlwind';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(1680, 'spell_warr_whirlwind');