Deal with moved publish_fieldmapper() method

Deal with moved publish_fieldmapper() method

This is a companion commit to
fac45ab9b1cb8924 / Move Fieldmapper API call to Application.pm

Without it, Flattener and Action/Trigger stop working with errors like
this:

[Mon Aug 20 13:50:18 2012] [error] [client XXX.XXX.XXX.XXX] Exception:
OpenSRF::EX::ERROR 2012-08-20T13:50:18 main -e:0 System ERROR:
Exception: OpenSRF::DomainObject::oilsMethodException
2012-08-20T13:50:18 OpenSRF::AppRequest
/usr/local/share/perl/5.10.1/OpenSRF/AppSession.pm:1064 <500>   *** Call
to [open-ils.fielder.flattened_search.execute.atomic] failed for session
[1345485018.767884163.96534353976], thread trace [1]:\nNo field by the
name publish_fieldmapper in Fieldmapper! at
/usr/local/share/perl/5.10.1/OpenILS/Utils/Fieldmapper.pm line
270.\n\n\n\n, referer:
http://XXXXXXX/eg/conify/global/actor/search_filter_group

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>