DB/BoT: corrected movement speed for Halfus Wyrmbreaker for all difficulty entries

sql/updates/world/4.3.4/2020_09_11_01_world.sql

@@ -0,0 +1 @@
+UPDATE `creature_template` SET `speed_walk`= 3.2, `speed_run`= 1.71429 WHERE `entry` IN (46209, 46210, 46211);