fix(DB/Quest) - Add the missing NPC Starters for Regthar Deathgate (#20762)

* Added NPC Starters

* Added delete to the new NPCs

data/sql/updates/pending_db_world/rev_1732828124635270700.sql

@@ -0,0 +1,6 @@
+--
+DELETE FROM `creature_queststarter` WHERE `id` IN (4485, 10540) AND `quest` = 1361;
+-- Adds NPCs Vol'jin and Belgrom Rockmaul as Quest Starters for Regthar Deathgate
+INSERT INTO `creature_queststarter` (`id`, `quest`) VALUES
+(4485, 1361),
+(10540, 1361);