Fix #12973: Don't exclude high score after using sandbox

src/cheat.cpp

@@ -20,20 +20,3 @@ void InitializeCheats()
 {
 	memset(&_cheats, 0, sizeof(Cheats));
 }
-
-/**
- * Return true if any cheat has been used, false otherwise
- * @return has a cheat been used?
- */
-bool CheatHasBeenUsed()
-{
-	/* Cannot use lengthof because _cheats is of type Cheats, not Cheat */
-	const Cheat *cht = (Cheat*)&_cheats;
-	const Cheat *cht_last = &cht[sizeof(_cheats) / sizeof(Cheat)];
-
-	for (; cht != cht_last; cht++) {
-		if (cht->been_used) return true;
-	}
-
-	return false;
-}