Added ELB_FULL_GRAPHIC_CONTROLLER_SDCARDDETECTINVERTED

The new define allows the sd card detect to be inverted or not from
Configuration.h

Marlin/Conditionals.h

@@ -33,7 +33,9 @@
       #define DEFAULT_LCD_CONTRAST 40
     #elif defined(ELB_FULL_GRAPHIC_CONTROLLER)
       #define DEFAULT_LCD_CONTRAST 110
-      #define SDCARDDETECTINVERTED
+      #ifdef ELB_FULL_GRAPHIC_CONTROLLER_SDCARDDETECTINVERTED
+        #define SDCARDDETECTINVERTED
+      #endif
       #define SDSLOW
       #define U8GLIB_LM6059_AF
     #endif

Marlin/Configuration.h

@@ -670,6 +670,7 @@ const bool Z_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the logic
 //
 // ==> REMEMBER TO INSTALL U8glib to your ARDUINO library folder: http://code.google.com/p/u8glib/wiki/u8glib
 //#define ELB_FULL_GRAPHIC_CONTROLLER
+//#define ELB_FULL_GRAPHIC_CONTROLLER_SDCARDDETECTINVERTED
 
 // The RepRapDiscount Smart Controller (white PCB)
 // http://reprap.org/wiki/RepRapDiscount_Smart_Controller