Fix producer_fec_fuzzer.

A field was removed from FecProtectionParams in
https://codereview.webrtc.org/1917083003.

BUG=webrtc:5066
R=turaj@webrtc.org, turajs@webrtc.org

Review URL: https://codereview.webrtc.org/1922283002 .

Cr-Original-Commit-Position: refs/heads/master@{#12518}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: d6b9d772c2dacecab151f2e1ee5d17de72198eec
1 file changed