adapt Container usage to new soko-web

src/Cli/AddUserCommand.php

@@ -1,7 +1,6 @@
 <?php namespace MapGuesser\Cli;
 
 use DateTime;
-use SokoWeb\PersistentData\PersistentDataManager;
 use MapGuesser\PersistentData\Model\User;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputArgument;
@@ -32,8 +31,7 @@ class AddUserCommand extends Command
         }
 
         try {
-            $pdm = new PersistentDataManager();
-            $pdm->saveToDb($user);
+            \Container::$persistentDataManager->saveToDb($user);
         } catch (\Exception $e) {
             $output->writeln('<error>Adding user failed!</error>');
             $output->writeln('');