Added forward and backward pin intizialization

NetSpeaker.ino

@@ -53,7 +53,9 @@ void setup() {
   
   // setup all pins (not SPI and other buses!)
   pinMode(sdCardEjectPin, INPUT);
+  pinMode(backwardButtonPin, INPUT);
   pinMode(pausePlaybackPin, INPUT);
+  pinMode(forwardButtonPin, INPUT);
   pinMode(readyPin, OUTPUT);
 
   // connect to sd card reader