Change "-LibvpxVp9Encoder-" to "-VP9-" for consistency. Bug: none Change-Id: I7a73759db00e92286fe9a4bbed8512baf91decdb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/206982 Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Commit-Queue: Åsa Persson <asapersson@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33249}