Prevent lcd_update stack overflow on SD Card change

Marlin/src/lcd/ultralcd.cpp

@@ -5035,17 +5035,19 @@ void lcd_update() {
     const bool sd_status = IS_SD_INSERTED;
     if (sd_status != lcd_sd_status && lcd_detected()) {
 
+      bool old_sd_status = lcd_sd_status; // prevent re-entry to this block!
+      lcd_sd_status = sd_status;
+
       if (sd_status) {
         safe_delay(1000); // some boards need a delay or the LCD won't show the new status
         card.initsd();
-        if (lcd_sd_status != 2) LCD_MESSAGEPGM(MSG_SD_INSERTED);
+        if (old_sd_status != 2) LCD_MESSAGEPGM(MSG_SD_INSERTED);
       }
       else {
         card.release();
-        if (lcd_sd_status != 2) LCD_MESSAGEPGM(MSG_SD_REMOVED);
+        if (old_sd_status != 2) LCD_MESSAGEPGM(MSG_SD_REMOVED);
       }
 
-      lcd_sd_status = sd_status;
       lcdDrawUpdate = LCDVIEW_CLEAR_CALL_REDRAW;
       lcd_implementation_init( // to maybe revive the LCD if static electricity killed it.
         #if ENABLED(LCD_PROGRESS_BAR)