usb_hid: Allow USB work to progress while waiting for tud_hid_ready
usb_hid: Allow USB work to progress while waiting for tud_hid_ready

Otherwise, examples like the one attached to the related issue fail
because tud_hid_ready never returns true.

Testing performed: Adapted the example to nrf particle xenon (it was
handy), removed dependency on IR, verified that the problem occurred
before this change, and that it was fixed after this change.

Closes: #2048

adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython