bf-imagej.sh: also update Bio-Formats jai_imageio

SCIFIO uses a repackaged version of jai_imageio, but the name still
clashes with the Bio-Formats version (whose fork was *not* repackaged).
To avoid the clash, we now do the same thing as with the two "scifio"
artifacts: the io.scif version lives in jars/ and the Bio-Formats one
lives in jars/bio-formats/.