Fix ADB led_set(); remove delay

- the 100ms delay causes keystroke drop; this is observable with
  pressing Numlock key on AEK repeatedly
- without the delay LED sync problem doesn't occur now

converter/adb_usb/led.c

@@ -23,7 +23,5 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 void led_set(uint8_t usb_led)
 {
-    // need a wait to send command without miss
-    _delay_ms(100);
     adb_host_kbd_led(~usb_led);
 }