USB Media Host followup

Restore HAS_SHARED_MEDIA

Marlin/src/HAL/LPC1768/main.cpp

   #include <debug_frmwrk.h>
 }
 
-#include "../../sd/cardreader.h"
 #include "../../inc/MarlinConfig.h"
 #include "../../core/millis_t.h"
 
+#include "../../sd/cardreader.h"
+
 extern uint32_t MSC_SD_Init(uint8_t pdrv);
 extern "C" int isLPC1769();
 extern "C" void disk_timerproc();
 
 // HAL idle task
 void HAL_idletask() {
-  #if HAS_SD_HOST_DRIVE
+  #if HAS_SHARED_MEDIA
     // If Marlin is using the SD card we need to lock it to prevent access from
     // a PC via USB.
     // Other HALs use IS_SD_PRINTING() and IS_SD_FILE_OPEN() to check for access but

Marlin/src/HAL/STM32F1/HAL.cpp

 
 // HAL idle task
 void HAL_idletask() {
-  #if HAS_SD_HOST_DRIVE
+  #if HAS_SHARED_MEDIA
     // If Marlin is using the SD card we need to lock it to prevent access from
     // a PC via USB.
     // Other HALs use IS_SD_PRINTING() and IS_SD_FILE_OPEN() to check for access but

Marlin/src/inc/Conditionals_post.h

     // mount/unmount the card and refresh it. So we disable card detect.
     //
     #undef SD_DETECT_PIN
+    #define HAS_SHARED_MEDIA 1
   #endif
 
   #if PIN_EXISTS(SD_DETECT)