[webrtc-pc] Pull Request: Remove redundant steps in setCodecParameters

dontcallmedom has just submitted a new pull request for https://github.com/w3c/webrtc-pc:

== Remove redundant steps in setCodecParameters ==
Could not detect a difference these 2 additional steps make beyond what the previous step does.

(I found this during the webrtc testing hackathon and asked @henbos who seemed to agree this was redundant on a quick look)

See https://github.com/w3c/webrtc-pc/pull/2152