Fix LED pin for Olimex STM32-H103

Author: jeanthom

src/stm32f103/olimexstm32h103/config.h

@@ -39,7 +39,7 @@
 #define LED_GPIO_PORT GPIOC
 #endif
 #ifndef LED_GPIO_PIN
-#define LED_GPIO_PIN  GPIO14
+#define LED_GPIO_PIN  GPIO12
 #endif
 #ifndef LED_OPEN_DRAIN
 #define LED_OPEN_DRAIN 1