[webrtc-encoded-transform] Pull Request: make generateKeyFrame take a list of rids and return void

fippo has just submitted a new pull request for https://github.com/w3c/webrtc-encoded-transform:

== make generateKeyFrame take a list of rids and return void ==
making it request a key frame for each rid or all of them if the list is empty.

Returning a promise resolving with a timestamp is not necessary since requesting a key frame is something the encoder might not be able or willing to satisfy.

See https://github.com/w3c/webrtc-encoded-transform/pull/165


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