Update pins_arduino.h

The built-in "Blink" LED on the new version of the RoboHeart development board is connected to IO13 instead of IO14.

Author: evgenimelan

variants/roboheart_hercules/pins_arduino.h

@@ -15,7 +15,7 @@
 
 #define SLEEP_MOTOR_ABC 2  //  nSLEEP 
 
-#define LED_ROBOHEART 14  // Built in LED
+#define LED_ROBOHEART 13  // Built in LED
 #define BUILTIN_LED LED_ROBOHEART // backward compatibility
 #define LED_BUILTIN LED_ROBOHEART