fix(DB/Gameobject): Empty Cauldron (#1911)

- Three same gameobjects was spawned at the same place
- Deleting two, not needed.

data/sql/updates/pending_db_world/rev_1559216385863936700.sql

@@ -0,0 +1,3 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1559216385863936700');
+
+DELETE FROM `gameobject` WHERE `guid` IN (268626,268625);