Update RunJobForm.php

Added VirtualFull option for manual defined Jobs. In my case, sometimes you have a Full Job and some Incremental  ones and you just one to merge them into a new Virtual Full. From the UI it is really simple to do it if we add this option to the menu.

webui/module/Job/src/Job/Form/RunJobForm.php

@@ -415,6 +415,7 @@ private function getLevelList()
       $selectData['Full'] = 'Full';
       $selectData['Differential'] = 'Differential';
       $selectData['Incremental'] = 'Incremental';
+      $selectData['VirtualFull'] = 'VirtualFull';
       return $selectData;
    }
 }