store subdomain in database instead of fqdn

this makes it more consistent with the locations table

dashboard/src/js/client.js

@@ -3736,7 +3736,7 @@ angular.module('Application').service('Client', ['$http', '$interval', '$timeout
             return 'Certificate(s) of ' + data.domains.join(',') + ' was cleaned up since they expired 6 months ago';
 
         case ACTION_DASHBOARD_DOMAIN_UPDATE:
-            return 'Dashboard domain set to ' + data.fqdn;
+            return 'Dashboard domain set to ' + data.fqdn || (data.subdomain + '.' + data.domain);
 
         case ACTION_DOMAIN_ADD:
             return 'Domain ' + data.domain + ' with ' + data.provider + ' provider was added';