Adjust qp-max settinhg in VP9 wrapper.

More closely matches the qp-max setting used in VP8.

TBR=stefan@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/39709004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@8177 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed