Remove unnecessary include

NicoHood · NicoHood · commit a343dd88d11b · 2015-10-08T17:24:09.000+02:00
Its included by HID.h anyways.
diff --git a/libraries/HID/HID.cpp b/libraries/HID/HID.cpp
@@ -16,7 +16,6 @@
    SOFTWARE.
  */
 
-#include "PluggableUSB.h"
 #include "HID.h"
 
 #if defined(USBCON)
