fix(DB/npc_trainer): Req mining skill for "Smelt Thorium" (#8544)

data/sql/updates/pending_db_world/rev_1634310421908550697.sql

@@ -0,0 +1,4 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1634310421908550697');
+
+-- Decreases the required mining skill level to learn Smelt Thorium to 230
+UPDATE `npc_trainer` SET `ReqSkillRank` = 230 WHERE `ID` = 201033 AND `SpellID` = 16153;