upgrader: Fix crash on SequenceLoader

include/class.sequence.php

@@ -205,7 +205,7 @@ class Sequence extends VerySimpleModel {
     }
 
     function __create($data) {
-        $instance = new static($data);
+        $instance = new self($data);
         $instance->save();
         return $instance;
     }

include/upgrader/streams/core/8f99b8bf-03ff59bf.task.php

@@ -13,7 +13,7 @@ class SequenceLoader extends MigrationTask {
         $i18n = new Internationalization($cfg->get('system_language', 'en_US'));
         $sequences = $i18n->getTemplate('sequence.yaml')->getData();
         foreach ($sequences as $s) {
-            Sequence::create($s)->save();
+            Sequence::__create($s);
         }
         db_query('UPDATE '.SEQUENCE_TABLE.' SET `next`= '
             .'(SELECT MAX(ticket_id)+1 FROM '.TICKET_TABLE.') '