Rename FILED_BIBLIOGRAPHY to FIELD_BIBLIOGRAPHY

Not sure why it was that way. I assume it was just a typo that
never was fixed.

Change-Id: I5767c8ff10abd687b12d209bacb74c3144ce7b25
Reviewed-on: https://gerrit.libreoffice.org/10443
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>