[TASK] allow multiple experience levels in TCA

Configuration/TCA/tx_sgjobs_domain_model_job.php

@@ -243,7 +243,7 @@ $columns = [
 				'foreign_table' => 'tx_sgjobs_domain_model_experience_level',
 				'foreign_table_where' => ' AND tx_sgjobs_domain_model_experience_level.sys_language_uid IN (0,-1) ORDER BY tx_sgjobs_domain_model_experience_level.sorting ASC',
 				'minitems' => 0,
-				'maxitems' => 1,
+				'maxitems' => 999,
 				'fieldControl' => [
 					'editPopup' => [
 						'disabled' => FALSE,