use default button border color

diff --git a/rBag/core.lua b/rBag/core.lua
index 2ff6a74..7765177 100644
--- a/rBag/core.lua
+++ b/rBag/core.lua
@@ -291,7 +291,7 @@ function Bags:SlotUpdate(id, button)
 		if Rarity then
 			button.Backdrop:SetBackdropBorderColor(GetItemQualityColor(Rarity))
         else
-			button.Backdrop:SetBackdropBorderColor(unpack(L.C.backdrop.edgeColor))
+			button.Backdrop:SetBackdropBorderColor(unpack(rButtonTemplate_Zork_SlotButtonConfig.backdrop.borderColor))
 		end
 	end