Bug 29697: Replace GetMarcBiblio occurrences with $biblio->metadata->record

Bug 29697: Replace GetMarcBiblio occurrences with $biblio->metadata->record

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
JD Amended patch:
-# FIXME Special case here

-    print "Biblio not found\n,";
+    print "Biblio not found\n";

- my $biblio = Koha::Biblio->find($hostbiblionumber);
+ my $biblio = Koha::Biblios->find($hostbiblionumber);

Rebased-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>