Re: [webrtc-pc] need to clear [[AssociatedMediaStreams]] in removeTrack?

@fippo It shouldn't, because the stream association is still tied to the transceiver. E.g. If I then do
```js
await sender.replaceTrack(trackB);
sender.direction = "sendrecv";
```
Then remotely (after renegotiation) the receiver.track would again pop up in the same-id remote stream.

Confused? See https://github.com/w3c/webrtc-pc/issues/1758 which I just filed.

What I think is true however, is that we probably don't need to keep a reference to the streams themselves, just their ids. Since keeping a stream open has side-effects (local camera staying on) that seems like an improvement (remember what's being sent may come from an entirely different stream).

-- 
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