Lines per page and chars per line can not be set before the
max values determined, otherwise we may get incorrect result
because of truncating to incorrect max values.

Change-Id: I9829af0dcfd744f4383a5f9034270b00fdfb15b8
Reviewed-on: https://gerrit.libreoffice.org/73280
Tested-by: Jenkins
Reviewed-by: Mark Hung <marklh9@gmail.com>