Fixed Xbox 360 crash

Minecraft.Client/PS3/Leaderboards/base64.h

@@ -2,6 +2,6 @@
 
 #include <string>
 
-std::string base64_encode(std::string str);
+std::string base64_encode(const std::string& str);
 std::string base64_encode(unsigned char const* , unsigned int len);
 std::string base64_decode(std::string const& s);