Fix: MenuItemSD, SPI clock slowdown when accessing SD card (4 MHz)

Author: lovyan03

src/MenuItemSD.cpp

@@ -9,7 +9,7 @@ MenuItemFS* MenuItemSD::newMenuItemFS(const String& title, const String& path, b
 fs::FS& MenuItemSD::getFS() const {
   if (0 == path.length()) {
     SD.end();
-    SD.begin(TFCARD_CS_PIN);
+    SD.begin( TFCARD_CS_PIN, SPI, 40000000);
   }
   return SD;
 }