Core: Pass string by const reference in SaveScreenShot

Source/Core/Core/Core.h

@@ -52,7 +52,7 @@ void SetState(EState _State);
 EState GetState();
 
 void SaveScreenShot();
-void SaveScreenShot(std::string name);
+void SaveScreenShot(const std::string& name);
 
 void Callback_WiimoteInterruptChannel(int _number, u16 _channelID, const void* _pData, u32 _Size);