🧑‍💻 Move PB0 init for MKS_ROBIN_NANO

Marlin/src/lcd/extui/mks_ui/tft_lvgl_configuration.cpp

 
   watchdog_refresh();     // LVGL init takes time
 
-  #if MB(MKS_ROBIN_NANO)
-    OUT_WRITE(PB0, LOW);  // HE1
-  #endif
-
   // Init TFT first!
   SPI_TFT.spi_init(SPI_FULL_SPEED);
   SPI_TFT.LCD_init();

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO.h

 //#define LED_PIN                           PB2
 
 #include "pins_MKS_ROBIN_NANO_common.h"
+
+#if HAS_TFT_LVGL_UI && FAN1_PIN != PB0 && HEATER_1_PIN != PB0
+  #define BOARD_INIT OUT_WRITE(PB0, LOW)
+#endif

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_common.h

 #ifndef HEATER_0_PIN
   #define HEATER_0_PIN                      PC3
 #endif
-#if HOTENDS == 1 && DISABLED(HEATERS_PARALLEL)
-  #ifndef FAN1_PIN
-    #define FAN1_PIN                        PB0
-  #endif
-#else
-  #ifndef HEATER_1_PIN
-    #define HEATER_1_PIN                    PB0
-  #endif
-#endif
 #ifndef FAN_PIN
   #define FAN_PIN                           PB1   // FAN
 #endif
   #define HEATER_BED_PIN                    PA0
 #endif
 
+#if HOTENDS == 1 && DISABLED(HEATERS_PARALLEL)
+  #ifndef FAN1_PIN
+    #define FAN1_PIN                        PB0
+  #endif
+#elif !defined(HEATER_1_PIN)
+  #define HEATER_1_PIN                      PB0
+#endif
+
 //
 // Power Supply Control
 //