vp9: Fix to vp9_svc sample encoder for bypass mode.
vp9: Fix to vp9_svc sample encoder for bypass mode.

This fix makes it bitexact to the default SVC pattern,
for the example 2 temporal layer case.

Change-Id: I4df2063b70f7aecbfc7082f29c8439e05f6db8ac

webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx