fix(DB/creature_template): Disciple of Naralax walking speed (#5073)

data/sql/updates/pending_db_world/rev_1617177621821036427.sql

@@ -0,0 +1,4 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1617177621821036427');
+
+-- Disciple of Naralex
+UPDATE `creature_template` SET `speed_walk`=0.8 WHERE `entry`=3678;