Copy-paste not working in snowflake client (global webrtcRemote is uninitialized)

The copy-paste rendezvous doesn't work in 6efb5cb8. The readSignalingMessages goroutine panics because the global webrtcRemote is nil at client/snowflake.go:142:

                webrtcRemote.answerChannel <- sdp

git bisect says b8815627 "defer conn.Close for simplicity and remove unnecessary goroutines, improve error handling (close !#12 (closed))" is the first bad commit.

I'm using the copy-paste rendezvous because I want to test a server locally for #18627 (moved).