correct path to steam_api header files

Index: steam_internal.h
--- steam_internal.h.orig
+++ steam_internal.h
@@ -2,9 +2,9 @@
 
 #include <stdio.h>
 
-#include "steamworks/public/steam/steam_api_common.h"
-#include "steamworks/public/steam/steam_api.h"
-#include "steamworks/public/steam/steam_api_flat.h"
+#include "goldberg_emulator/steam/steam_api_common.h"
+#include "goldberg_emulator/steam/steam_api.h"
+#include "goldberg_emulator/steam/steam_api_flat.h"
 
 #include <string>
 
