Reverse encoder for FYSETC Mini 12864 2.1 + SKR 1.3 (#17010)

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_3.h

@@ -300,6 +300,7 @@
         #endif
       #elif ENABLED(FYSETC_MINI_12864_2_1)
         #define NEOPIXEL_PIN    EXPA1_05_PIN
+        #define REVERSE_ENCODER_DIRECTION
       #endif
 
     #else // !FYSETC_MINI_12864