Remove unnecessary include

NicoHood · NicoHood · commit 79f5715c21a8 · 2015-10-08T17:24:09.000+02:00
Its included by HID.h anyways.
diff --git a/hardware/arduino/avr/libraries/HID/HID.cpp b/hardware/arduino/avr/libraries/HID/HID.cpp
@@ -16,7 +16,6 @@
    SOFTWARE.
  */
 
-#include "PluggableUSB.h"
 #include "HID.h"
 
 #if defined(USBCON)
