IOS: Fix savestates for Bluetooth passthrough

This fixes savestates when using Bluetooth passthrough by keeping track
of pending transfer commands and discarding them on state load, so that
the emulated software receives a reply to IOS requests as expected.

With this change, savestates in BT passthrough should work as long as
no Wiimote is connected when creating the savestate and when
restoring it. Yes, I know this is an important limitation -- but
that is probably the best we can do, and it's still better than
completely broken savestates.

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