IOS: Remove from m_opened_devices in OH0::OnDeviceChange

I've been playing Rock Band 3 recently and have experienced a bug where
sometimes if you disconnect and reconnect a USB microphone, the game
won't pick up on it connecting, not even it you disconnect and reconnect
it again. An investigation into what's going on inside Dolphin shows
that when the game triggers a call to OH0::DeviceOpen after the device
has been reinserted, Dolphin doesn't open the device because it's
already present in m_opened_devices.

Removing the device from m_opened_devices after calling OH0::TriggerHook
in OH0::OnDeviceChange resolves this specific issue in my testing. Doing
this matches us removing the device from m_opened_devices after calling
OH0::TriggerHook in OH0::DeviceClose, but I haven't looked at exactly
what real IOS does.

I have been able to reproduce a much rarer issue that has the same
symptoms on the surface but where OH0::DeviceOpen gets past its
m_opened_devices check. I'm currently not sure what the cause of this
remaining issue is.

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