correct steam header files location

Index: steam_input.cpp
--- steam_input.cpp.orig
+++ steam_input.cpp
@@ -1,6 +1,6 @@
 #include "steam_input.h"
-#include "extern/steamworks/public/steam/isteaminput.h"
-#include "extern/steamworks/public/steam/isteamutils.h"
+#include "goldberg_emulator/steam/isteaminput.h"
+#include "goldberg_emulator/steam/isteamutils.h"
 #include "clock.h"
 
 void MySteamInput::init() {
