don't show save button for closed ticket

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@23006 35612d4c-9d10-0410-837c-bf9dd1be60d7
revert previous

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@23007 35612d4c-9d10-0410-837c-bf9dd1be60d7