Keep feedback params in SetDefaultEncoderConfig.

Prevents NACK etc. from breaking completely as it won't be reported in
the generated SDP.

BUG=1788
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/40109004

Cr-Commit-Position: refs/heads/master@{#8519}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8519 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed