Improved "Vial of the Sands" acquire filter

diff --git a/Database/Alchemy.lua b/Database/Alchemy.lua
index e96a753..7948c7d 100644
--- a/Database/Alchemy.lua
+++ b/Database/Alchemy.lua
@@ -2214,7 +2214,7 @@ function addon:InitAlchemy()
 	recipe = AddRecipe(93328, V.CATA, Q.EPIC)
 	recipe:SetCraftedItemID(65891)
 	recipe:SetSkillLevels(525, 525, 525, 530, 535)
-	recipe:AddFilters(F.ALLIANCE, F.HORDE, F.TRAINER, F.IBOE, F.RBOP)
+	recipe:AddFilters(F.ALLIANCE, F.HORDE, F.WORLD_DROP, F.IBOE, F.RBOP)
 	recipe:AddCustom(47)

 	-- Draught of War -- 93935