Add COPYWIN constants

include/menu.h

@@ -123,7 +123,7 @@ void sub_8198314(void);
 void sub_8198180(const u8 *string, u8 a2, bool8 copyToVram);
 void ResetBgPositions(void);
 void AddTextPrinterWithCustomSpeedForMessage(bool8 allowSkippingDelayWithButtonPress, u8 speed);
-void sub_8198C78(void);
+void EraseYesNoWindow(void);
 void PrintTextArray(u8 windowId, u8 fontId, u8 left, u8 top, u8 lineHeight, u8 itemCount, const struct MenuAction *strs);
 void Menu_LoadStdPal(void);