remove the backup check notification and route

it seems we decided that instead of a notification, we display a warning in
the backups view itself (see #719).

src/cloudron.js

@@ -83,12 +83,6 @@ function onActivated(options, callback) {
     async.series([
         platform.start.bind(null, options),
         cron.startJobs,
-        function checkBackupConfiguration(done) {
-            backups.checkConfiguration(function (error, message) {
-                if (error) return done(error);
-                notifications.alert(notifications.ALERT_BACKUP_CONFIG, 'Backup configuration is unsafe', message, done);
-            });
-        },
         // disable responding to api calls via IP to not leak domain info. this is carefully placed as the last item, so it buys
         // the UI some time to query the dashboard domain in the restore code path
         (done) => setTimeout(() => reverseProxy.writeDefaultConfig({ activated :true }, done), 30000)