Device.__init__ creates self.features as an empty dict ({}) when the
reported _protocol is <2.0, reserving FeaturesArray for HID++ 2.0.
The protocol floor in the protocol property only helps code paths that
access the property (e.g. feature_request's `if self.protocol >= 2.0`).
But __init__ reads the raw self._protocol attribute, so a wired G522
(reports 1.1) ends up with self.features = {}.
When solaar show later triggers `self.features._check()` inside
feature_request, the dict has no _check method → AttributeError →
crashes `solaar show` for the wired G522.
Fix: use FeaturesArray unconditionally when the device is Centurion.
The protocol version reported by these dongles is cosmetic — all
Centurion devices speak HID++ 2.0 features.
0dfc7a22fa