[configurator] Enable configuring PS2+ controller on different ports

[kbhomes]

All configurator code currently assumes the PS2+ is found on port 1. It should be able to manage one in any port, and switch between if there are multiple.

Also maybe part of this issue: allow standard controllers to navigate the UI, including while a PS2+ controller is being managed in another port. Maybe not a common use case, but could be another solution to flashing the firmware of a corrupted PS2+.