Local rtcp-fb values are used when answering #1968
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Description
Currently, pion uses remote rtcp-fb when answering.
According to https://tools.ietf.org/id/draft-ietf-rtcweb-sdp-08.html a=rtcp-fb lines should list supported feedback mechanisms. This change makes pion use rtcp-fb values provided by the user instead of using whatever was given by the remote pc.