quantize test: check skip_block
quantize test: check skip_block

Not all sizes were tested previously. Only 4x4 and 32x32

Change-Id: I4b4beab1b92a810a097a7306de04cc9e0e260315

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