Revert attempt to prevent encoding corruption that was causing encoding corruption

Revert attempt to prevent encoding corruption that was causing encoding corruption

LDR/09 was never showing up as 'a' where it was being tested, and adding the
'a' was preventing a reconversion to UTF8. It somewhat looks like the UTF8
MARCXML input gets converted to MARC8 as part of MARC::Batch's magic, then
gets converted back to UTF8 by MARC::File::XML::as_xml_record(). Seems like
this would mean potential performance / encoding problems but it works, which
is better than what my meddlesome tests were doing.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@17776 dcc99617-32d9-48b4-a31d-7c20da2025e4