[FIX] print: Make page aliases work in print mode.
tiki-print.php should really be changed over to use renderlib which does all this properly, but adding a minimal fix here to disrupt as little as possible. Should fix wish4891, thanks jcarter)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48509 b456876b-0849-0410-b77d-98878d47e9d5