can't change ticket type if predefined see #4829


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@22798 35612d4c-9d10-0410-837c-bf9dd1be60d7
fix last 


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@22799 35612d4c-9d10-0410-837c-bf9dd1be60d7