Fix Visual Micro "Arduino IDE for Visual Studio" support (#16418)

Marlin/src/gcode/calibrate/G425.cpp

@@ -20,7 +20,7 @@
  *
  */
 
-#include "../../Marlin.h"
+#include "../../MarlinCore.h"
 
 #if ENABLED(CALIBRATION_GCODE)
 

Marlin/src/gcode/calibrate/M100.cpp

@@ -28,7 +28,7 @@
 #include "../queue.h"
 #include "../../libs/hex_print_routines.h"
 
-#include "../../Marlin.h" // for idle()
+#include "../../MarlinCore.h" // for idle()
 
 /**
  * M100 Free Memory Watcher