Fix card init function in SdCardTest example

examples/HardwareTesting/SdCardTest/SdCardTest.ino

   Serial.println("------------");
 
   // First, detect the card
-  status = card.init(10); // Audio shield has SD card SD on pin 10
+  status = card.init(SPI_FULL_SPEED, 10); // Audio shield has SD card SD on pin 10
   if (status) {
     Serial.println("SD card is connected :-)");
   } else {