implemented alternative_route usr preference handling

lib/admin/Controller/subscriber.pm

@@ -789,6 +789,10 @@ sub update_preferences : Local {
 
     $$preferences{on_preselect} = $c->request->params->{on_preselect};
 
+    ### alternative routing ###
+
+    $$preferences{alternative_route} = $c->request->params->{alternative_route} ? 1 : undef;
+
     ### save settings ###
 
     unless(keys %messages) {

root/tt/subscriber_preferences.tt

@@ -60,7 +60,9 @@
                       || preference.key == "clir"
                       || preference.key == "mct"
                       || preference.key == "in_use"
-                      || preference.key == "ignore_allowed_ips" %]
+                      || preference.key == "ignore_allowed_ips"
+                      || preference.key == "alternative_route"
+                %]
                 <tr>
                   <td class="tdkey">[% preference.key %]:</td>
                   <td>