Delete a button definition

ChazJin · Cruz Monrreal II · commit e95021647dbc · 2018-12-27T23:00:37.000-06:00
diff --git a/targets/TARGET_GigaDevice/TARGET_GD32F30X/TATGET_GD32F307VG/PinNames.h b/targets/TARGET_GigaDevice/TARGET_GD32F30X/TATGET_GD32F307VG/PinNames.h
@@ -177,11 +177,9 @@ typedef enum {
 
     KEY2        = PORTA_0,
     KEY3        = PORTB_1,
-    KEY4        = PORTD_2,
 
     BUTTON1     = KEY2,
     BUTTON2     = KEY3,
-    BUTTON3     = KEY4,
 
     SERIAL_TX   = PORTA_9,
     SERIAL_RX   = PORTA_10,
