Clean up SKR Pro v1.1 pins (#17653)

Marlin/src/pins/stm32f4/pins_BTT_SKR_PRO_V1_1.h

 #define FAN2_PIN                            PE6
 
 #ifndef E0_AUTO_FAN_PIN
-  #define E0_AUTO_FAN_PIN                   PC9
+  #define E0_AUTO_FAN_PIN               FAN1_PIN
 #endif
 
 //
  *           ￣￣
  *            W1
  */
-#define ESP_WIFI_MODULE_COM 6                     // must also set SERIAL_PORT or SERIAL_PORT_2 to this
-#define ESP_WIFI_MODULE_BAUDRATE        BAUDRATE  //115200   // use BAUDRATE ?  would guarantee same baud rate as SERIAL_PORT & SERIAL_PORT_2
+#define ESP_WIFI_MODULE_COM 6                     // Must also set SERIAL_PORT or SERIAL_PORT_2 to this
+#define ESP_WIFI_MODULE_BAUDRATE        BAUDRATE  // Must use same BAUDRATE as SERIAL_PORT & SERIAL_PORT_2
 #define ESP_WIFI_MODULE_RESET_PIN           -1
 #define ESP_WIFI_MODULE_ENABLE_PIN          PG1