vacation.pl:
- fix typo (reported by Jan Kruis on the mailinglist)


git-svn-id: http://postfixadmin.svn.sourceforge.net/svnroot/postfixadmin/trunk@1400 a1433add-5e2c-0410-b055-b7f2511e0802
Merge branch 'master' of github.com:valkum/postfixadmin