DB/Loot: unlink references that were referencing themselves, resulting in infite loops

closes #319

sql/updates/world/4.3.4/2022_01_16_00_world.sql

@@ -0,0 +1 @@
+UPDATE `reference_loot_template` SET `Reference`= 0 WHERE `Entry` IN (11919, 11920, 11921, 13006, 13007, 13008, 13009, 13010) AND `Entry`= `Reference`;