hsqldb: (billing) comply with new configuration policy

Updates hsqldb.properties to match billing.properties

Testing done:

Tested dcache database ls with billingToDb on and off.
Ran dcache and checked logs.
Inspected var/plots for plots.

Target: master
Patch: http://rb.dcache.org/r/5780/
Require-book: no
Require-notes: no
Acked-by: Paul