Reduce memoizer wait to 0 (Fix #10337)

See http://trac.openmicroscopy.org.uk/ome/ticket/10337

For relatively fast setId alls, no bfmemo file
was being produced. Lowering this value to zero
shaved off 1/3 of the setId time, though, even
for fast files.

This should also prevent discrepancies when the
system is underload: now a memo file will always
be produced.

*To test, check the `DEBUG` messages for the `loci.formats.Memoizer` in the Blitz-0.log. There should be no memo file creations which are skipped. Even a fake file import should create one.*