DB/Spawns: Remove some duplicates

Closes #22108

sql/updates/world/3.3.5/2018_07_08_09_world_335.sql

@@ -0,0 +1,3 @@
+DELETE FROM `creature` WHERE `guid` IN (42847,42850,37624,3828,38851,38824,51692,51697,51704,51699);
+DELETE FROM `creature_addon` WHERE `guid` IN (42847,42850,37624,3828,38851,38824,51692,51697,51704,51699);
+DELETE FROM `spawn_group` WHERE `spawnId` IN (42847,42850,37624,3828,38851,38824,51692,51697,51704,51699) AND `spawnType`=0;