Fix solution

[gorisanson]

The "icecandidiate" event listener should be attached
before calling "RTCPeerConnection.setLocalDescription()".

The "icecandidate" event occur as a result of calling
await peerConnection.setLocalDescription(offer);.
(reference: https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/icecandidate_event)
So it should be attached earlier.

In the original solution, since the "icecandidate" event handler is attached too late, the callee can not receive the caller ice candidates. (We can check it on log on console since Got new remote ICE candidate: does not appear on callee's console log.) In spite of this error, the original solution somehow works when it is tested on LAN. But it does not work on WAN.

I checked that it works on WAN after fixing this error.

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[gorisanson]

@googlebot I signed it!

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[ErikHellman]

Looks good. Thanks for the fix!