LP1689576: Fix ALARM -> ALRM Typo

LP1689576: Fix ALARM -> ALRM Typo

In Biblio.pm, when trying to set a timeout handler for $SIG{ALARM}
when retrieving cached facets as part of a catalog search,
a warning is dropped in the logs to this effect:
"No such signal: SIGALARM at
/usr/local/share/perl/5.18.2/OpenILS/Application/Search/Biblio.pm
line 1411"
When using $SIG{ALRM} instead the handler is set as expected.

Signed-off-by: Jason Boyer <jboyer@library.in.gov>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>