DB/Spells: set the correct learning spells for paladin mounts

closes TrinityCore#4778

sql/updates/world/2012_01_14_01_world_npc_trainer.sql

@@ -0,0 +1,14 @@
+-- fix summon charger for horde
+UPDATE `npc_trainer` SET `spell` = 34767 WHERE `spell` = 34766;
+DELETE FROM `spell_required` WHERE `spell_id` = 34767 AND `req_spell` = 33391;
+INSERT INTO `spell_required` (`spell_id`, `req_spell`) VALUES (34767, 33391);
+
+-- fix summon charger for alliance
+UPDATE `npc_trainer` SET `spell` = 23214 WHERE `spell` = 23215;
+DELETE FROM `spell_required` WHERE `spell_id` = 23214 AND `req_spell` = 33391;
+INSERT INTO `spell_required` (`spell_id`, `req_spell`) VALUES (23214, 33391);
+
+-- fix dreadsteed for warlocks
+UPDATE `npc_trainer` SET `spell` = 23161, `reqskill` = 0, `reqskillvalue` = 0 WHERE `spell` = 23160;
+DELETE FROM `spell_required` WHERE `spell_id` = 23161 AND `req_spell` = 33391;
+INSERT INTO `spell_required` (`spell_id`, `req_spell`) VALUES (23161, 33391);