Core/Spells Fix Spell Inferno, used by boss Baron Geddon

This is based on the cmangos fix https://github.com/cmangos/mangos-classic/commit/7556165b3e15f574602fcb0ea4188db8186ccee6

Also correct the spellId of Armageddon spell

sql/updates/world/2016_04_15_99_world.sql

@@ -0,0 +1,3 @@
+DELETE FROM `spell_script_names` WHERE `ScriptName`='spell_baron_geddon_inferno';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(19695, 'spell_baron_geddon_inferno');