Bug 3580 Sort the facets categories so they don't move every search.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Ian Walls <ian.walls@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>

opac/opac-search.pl

@@ -431,6 +431,7 @@ if ($facets) {
     foreach my $f (@$facets) {
         $f->{facets} = [ sort { uc($a->{facet_title_value}) cmp uc($b->{facet_title_value}) } @{ $f->{facets} } ];
     }
+    @$facets = sort {$a->{expand} cmp $b->{expand}} @$facets;
 }
 
 # use Data::Dumper; print STDERR "-" x 25, "\n", Dumper($results_hashref);