SwTextInputFieldPortion::Format has previously tried to erase the
input field special chars, which caused the words not breaking as
expected or in the same way as normal text. It appears that it is
actually not necessary to do this at all so just calling the super
class method SwTextPortion::Format does the job and fixes the
problem. After testing I could not find anything that is obviously
wrong.

Change-Id: Ie763f55ad55863dd224425dc481b7100deb639fa
(cherry picked from commit 5e1714fd)
Reviewed-on: https://gerrit.libreoffice.org/19349Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit 9c9e9e15)