Fix for MAX_VFAT_ENTRIES sanity check

Marlin/src/inc/Conditionals_post.h

   #define NOT_A_PIN 0 // For PINS_DEBUGGING
 #endif
 
+// Number of VFAT entries used. Each entry has 13 UTF-16 characters
+#if ENABLED(SCROLL_LONG_FILENAMES)
+  #define MAX_VFAT_ENTRIES (5)
+#else
+  #define MAX_VFAT_ENTRIES (2)
+#endif
+
 // Force SDCARD_SORT_ALPHA to be enabled for Graphical LCD on LPC1768
 // because of a bug in the shared SPI implementation. (See #8122)
 #if defined(TARGET_LPC1768) && ENABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER)

Marlin/src/sd/SdFatConfig.h

 
 #define FILENAME_LENGTH 13 // Number of UTF-16 characters per entry
 
-// Number of VFAT entries used. Each entry has 13 UTF-16 characters
-#undef MAX_VFAT_ENTRIES
-#if ENABLED(SCROLL_LONG_FILENAMES)
-  #define MAX_VFAT_ENTRIES (5)
-#else
-  #define MAX_VFAT_ENTRIES (2)
-#endif
-
 // Total bytes needed to store a single long filename
 #define LONG_FILENAME_LENGTH (FILENAME_LENGTH * MAX_VFAT_ENTRIES + 1)