Core/Spells: remove 'Vanish Purge' hack, the spell is present on DB and is copy of one in vanilla DBC

Thanks to killerwife for the heads-up

sql/updates/world/4.3.4/2022_05_08_00_world.sql

@@ -0,0 +1,3 @@
+DELETE FROM `spell_script_names` WHERE `ScriptName`='spell_rog_vanish';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(-11327, 'spell_rog_vanish');