Core/Scripts: Adjust SQL-update for 10462 to include a delete-query for the affected spell (prevents a possible reinsert-error during import)

Thanks to leak for noticing.

--HG--
branch : trunk

sql/updates/10462_world_spell_script_names.sql

@@ -1 +1,2 @@
+DELETE FROM `spell_script_names` WHERE `spell_id`=6474;
 INSERT INTO `spell_script_names` (`spell_id`,`ScriptName`) VALUES (6474, 'spell_sha_earthbind_totem');