Another layer of escaping for the escapes in the DB update script

Another layer of escaping for the escapes in the DB update script

Apologies for the previous patch that led to breakage; I "tested" in a
script in which I had already hardcoded the answer I wanted after
running into problems with the previous version of the script. Not
good testing practice.

Thanks to Bill Erickson for suggesting the extra escapes. Tested in
a clean environment this time, and it works.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@19843 dcc99617-32d9-48b4-a31d-7c20da2025e4