indeo3: fix off by one in MV validity check

CC:libav-stable@libav.org
indeo3: use put_pixels instead of put_no_rnd_pixels in copy_cell()

They are the same in this case, except put_pixels also has blocksizes
smaller than 8.
FATE: add an additional indeo3 test

It is a part of the sample that got broken by recent indeo3 changes.