loot: only call LootSlot in vanilla clients

This part heavily relies on loot slot limitations in vanilla
that only allow to autoloot when an item was already clicked.
Without those limitations present in TBC, it had the side-effect,
that everything was auto-looted even without confirmation.

modules/loot.lua

@@ -714,7 +714,7 @@ pfUI:RegisterModule("loot", "vanilla:tbc", function ()
       if event == "LOOT_BIND_CONFIRM" then
         LootSlot(arg1)
         StaticPopup1Button1:Click()
-      elseif event == "LOOT_OPENED" then
+      elseif event == "LOOT_OPENED" and pfUI.client <= 11200 then
         for i=1,GetNumLootItems() do
           LootSlot(i)
         end