Rename USB scripts according to the recent USB command renames.

packages/usb/blink-led-pwm-brithness.js

@@ -0,0 +1,12 @@
+#!/usr/bin/env node
+const uhk = require('./uhk');
+
+let areLedsEnabled = true;
+
+const device = uhk.getUhkDevice();
+setInterval(() => {
+    areLedsEnabled = !areLedsEnabled;
+    const brightnessPercent = areLedsEnabled ? 100 : 0;
+
+    device.write(uhk.getTransferData(new Buffer([uhk.usbCommands.setLedPwmBrightness, brightnessPercent])));
+}, 500);