- Removed the data-label-wrap token and related code in xmloff module.

- Using the already present `fo:wrap-option` seems to be the preferred
solution: investigated to see how the token is imported exported: the
class `XMLWordWrapPropertyHdl` takes care of that, luckily it converts
the token to a boolean property.

- Fixed a minor issue in the code for the data label dialog.

Change-Id: Id050fdfeedd3af7fb79be96bfe157c61c4b44191
Reviewed-on: https://gerrit.libreoffice.org/19197Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Andras Timar <andras.timar@collabora.com>