WX: HiDPI: CheatsWindow

Changed the Cheat Search tab to disable the scan buttons while there is
not a game running and enable when it starts. Also added double-click to
create code to the result list.

Source/Core/DolphinWX/Cheats/CreateCodeDialog.h

@@ -26,6 +26,4 @@ private:
   wxCheckBox* m_checkbox_use_hex;
 
   void PressOK(wxCommandEvent&);
-  void PressCancel(wxCommandEvent&);
-  void OnEvent_Close(wxCloseEvent& ev);
 };