Uses sorting field by default in minor version

Configuration/TCA/tx_typo3roadmap_domain_model_minorversion.php

@@ -10,7 +10,8 @@ return array(
         'tstamp'            => 'tstamp',
         'crdate'            => 'crdate',
         'cruser_id'         => 'cruser_id',
-        'defaultSortBy'     => 'version',
+        'defaultSortBy'     => 'sorting',
+        'sortby'            => 'sorting',
         'delete'            => 'deleted',
         'enablecolumns'     => array(
             'disabled' => 'hidden',