fix library properties

Author: facchinm

library.properties

@@ -4,6 +4,6 @@ author=Gary Grewal, Arduino
 maintainer=Arduino <info@arduino.cc>
 sentence=Allows an Arduino board with USB capabilites to act as a MIDI instrument over USB. For Leonardo/Micro only
 paragraph=
-category=USB
+category=Device Control
 url=http://www.arduino.cc/en/Reference/MIDIUSB
-architectures=*
+architectures=*