* device: seed Centurion device kind=headset at construction
Centurion-transport devices have no static descriptor and are not
receiver-paired, so their kind was only resolved by an online feature
scan. A headset powered off when Solaar started showed no kind, hence
no headphone icon in the tray/window — unlike receiver-paired mice and
keyboards, whose kind comes from the receiver's persistent pairing
registers.
Every Centurion-transport device seen so far is a headset, and the
centurion flag is known at construction time. Seed _kind=headset there
so the icon is correct offline and on first run. Drop the now-dead
online _infer_kind_centurion() feature scan and its Centurion branch
in the kind property.
* centurion: seed child headset kind via pairing_info
The construction-time kind=headset seeding only covered the direct
create_device path. G522-style devices reach a CenturionReceiver,
whose notify_devices() builds the headset as a child Device with
device_info=None and sets dev.centurion=True only after __init__ —
so the __init__ guard never fired and the child kept kind=None.
Set kind=headset in the pairing_info dict the receiver already passes
into Device.__init__, which covers the bridge path. Both paths now
seed the kind offline.
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