machines.ignavia: enable Xbox Wireless Controller via xpadneo
Pairing an Xbox Wireless Controller over Bluetooth (LE HoG) on stock
bluez 5.86 failed with "Connection terminated due to authentication
failure" on every connection attempt after pair. Enable xpadneo so the
hid_xpadneo driver handles the controller, and add two bluez tweaks
that resolve the LE auth loop:
* JustWorksRepairing = always: accept fresh pairings without requiring
a manual remove of the prior bond.
* Privacy = device: pin the host BT address so the controller's stored
bond key isn't invalidated when bluez rotates resolvable addresses.
Assisted-by: Claude Code (claude-opus-4-7[1m])