Correct rq_model_update when recode_count == 1
Correct rq_model_update when recode_count == 1

This will reduce the avg recode times per frame form
3.19 to 2.81 when targeting 15% error margin for
target bitrate per frame.

Change-Id: I28c9ec09a1b1318c09fe5229ccb7e51b32b9dfb9

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