Do SD sort order in CardReader

Marlin/src/lcd/extui/ui_api.cpp

@@ -1039,13 +1039,7 @@ namespace ExtUI {
   bool FileList::seek(const uint16_t pos, const bool skip_range_check) {
     #if ENABLED(SDSUPPORT)
       if (!skip_range_check && (pos + 1) > count()) return false;
-      const uint16_t nr =
-        #if ENABLED(SDCARD_RATHERRECENTFIRST) && DISABLED(SDCARD_SORT_ALPHA)
-          count() - 1 -
-        #endif
-      pos;
-
-      card.getfilename_sorted(nr);
+      card.getfilename_sorted(SD_ORDER(pos, count()));
       return card.filename[0] != '\0';
     #else
       UNUSED(pos);

Marlin/src/lcd/menu/menu_media.cpp

@@ -140,14 +140,7 @@ void menu_media() {
 
   if (ui.should_draw()) for (uint16_t i = 0; i < fileCnt; i++) {
     if (_menuLineNr == _thisItemNr) {
-      const uint16_t nr =
-        #if ENABLED(SDCARD_RATHERRECENTFIRST) && DISABLED(SDCARD_SORT_ALPHA)
-          fileCnt - 1 -
-        #endif
-      i;
-
-      card.getfilename_sorted(nr);
-
+      card.getfilename_sorted(SD_ORDER(i, fileCnt));
       if (card.flag.filenameIsDir)
         MENU_ITEM(sdfolder, MSG_MEDIA_MENU, card);
       else

Marlin/src/sd/cardreader.cpp

@@ -924,7 +924,7 @@ void CardReader::cdroot() {
 
         // Init sort order.
         for (uint16_t i = 0; i < fileCnt; i++) {
-          sort_order[i] = TERN(SDCARD_RATHERRECENTFIRST, fileCnt - 1 - i, i);
+          sort_order[i] = SD_ORDER(i, fileCnt);
           // If using RAM then read all filenames now.
           #if ENABLED(SDSORT_USES_RAM)
             selectFileByIndex(i);

Marlin/src/sd/cardreader.h

@@ -29,6 +29,8 @@
   #define SD_RESORT 1
 #endif
 
+#define SD_ORDER(N,C) (TERN(SDCARD_RATHERRECENTFIRST, C - 1 - (N), N))
+
 #define MAX_DIR_DEPTH     10       // Maximum folder depth
 #define MAXDIRNAMELENGTH   8       // DOS folder name size
 #define MAXPATHNAMELENGTH  (1 + (MAXDIRNAMELENGTH + 1) * (MAX_DIR_DEPTH) + 1 + FILENAME_LENGTH) // "/" + N * ("ADIRNAME/") + "filename.ext"