remove unnecessary file

modules/game_npctrade/callbacks.txt

@@ -1,13 +0,0 @@
-void processOpenNpcTrade(const std::vector<std::tuple<ItemPtr, std::string, int, int, int>>& items);
-    void processPlayerGoods(int money, const std::vector<std::tuple<ItemPtr, int>>& goods);
-    void processCloseNpcTrade();
-
-g_lua.callGlobalField("g_game", "onOpenNpcTrade", items);
-    g_lua.callGlobalField("g_game", "onPlayerGoods", goods);
-    g_lua.callGlobalField("g_game", "onCloseNpcTrade");
-
- // npc trade related
-    void inspectNpcTrade(const ItemPtr& item);
-    void buyItem(const ItemPtr& item, int amount, bool ignoreCapacity, bool buyWithBackpack);
-    void sellItem(const ItemPtr& item, int amount, bool ignoreEquipped);
-    void closeNpcTrade();