vp9: fix non bitexact when reuse_inter_pred is 0.
vp9: fix non bitexact when reuse_inter_pred is 0.

when the best filter selected is not EIGHTTAP_SMOOTH, and
reuse_inter_pred is 0, pred buffer was not pointing to the right place.

Change-Id: I5b519fedd2d892bf140879faa74b463a161e253b

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