Some adapters don't have the correct interface class, so they are not
recognised as Bluetooth adapters. It seems that apart from hardcoding
VIDs/PIDs (which is how it's done in the Linux kernel, and which I'm
not very fond of), there is no other way to detect if a device is a
Bluetooth adapter or not.
This change makes Dolphin skip the descriptor check when trying to find
a usable adapter for Bluetooth Passthrough if the use of a specific
adapter was forced; it is assumed that the user knows what they are
doing if they hand-edited their config file.
This allows such adapters to be used.
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