Fix MKS MINI 12864 display blank out on MKS TinyBee

Fix for the MKS MINI 12864 v3 LCD screen being set blank black and showing nothing in some cases (e.g. accessing SD contents from ESP3D web interface)

Marlin/src/HAL/ESP32/u8g_esp32_spi.cpp

@@ -32,6 +32,10 @@
 #include "HAL.h"
 #include "SPI.h"
 
+#if ENABLED(SDSUPPORT)
+#include "../../sd/cardreader.h"
+#endif //SDSUPPORT
+
 static SPISettings spiConfig;
 
 
@@ -45,6 +49,16 @@ static SPISettings spiConfig;
 
 uint8_t u8g_eps_hw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
   static uint8_t msgInitCount = 2; // Ignore all messages until 2nd U8G_COM_MSG_INIT
+
+
+#if ENABLED(MKS_MINI_12864_V3) && (MOTHERBOARD == BOARD_MKS_TINYBEE)
+#if ENABLED(SDSUPPORT)
+  if (card.flag.saving || card.flag.logging) {
+      return 0;
+  }
+#endif //SDSUPPORT
+#endif //ENABLED(MKS_MINI_12864_V3)  && (MOTHERBOARD == BOARD_MKS_TINYBEE)
+
   if (msgInitCount) {
     if (msg == U8G_COM_MSG_INIT) msgInitCount--;
     if (msgInitCount) return -1;