backend: use named routes in url_for

lib/PoorBooru/Backend/Controller/Tags.pm

@@ -23,7 +23,7 @@ sub list ($self)
 	my @tags = map +{
 		name  => $_->{name},
 		count => $_->{count},
-		uri   => $self->url_for("/tag/$_->{name}"),
+		uri   => $self->url_for("tag_show", tag_id_or_name => $_->{name}),
 	}, @{$res->json->{tags}};
 
 	return $self->render(