Bug 26407: fix query in 'title exists' in `search_for_data_inconsistencies.pl`

Bug 23871 added check for 'title exists' to `search_for_data_inconsistencies.pl`.
There is a typo in DBIx query to create or : hashref instead of arrayref.

Test plan :
1) Change title of biblio record XXX in SQL :
   UPDATE biblio SET title = '' WHERE biblionumber=XXX
2) Change title of biblio record YYY in SQL :
   UPDATE biblio SET title = NULL WHERE biblionumber=YYY
3) Run misc/maintenance/search_for_data_inconsistencies.pl
4) Check you see both records

Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

misc/maintenance/search_for_data_inconsistencies.pl

@@ -196,7 +196,12 @@ use C4::Biblio;
 }
 
 {
-    my $biblios = Koha::Biblios->search({ -or => { title => undef, title => '' }});
+    my $biblios = Koha::Biblios->search({
+        -or => [
+            title => '',
+            title => undef,
+        ]
+    });
     if ( $biblios->count ) {
         my ( $title_tag, $title_subtag ) = C4::Biblio::GetMarcFromKohaField( 'biblio.title' );
         my $title_field = $title_tag // '';