It is expected that <text:text-input> will be converted to
{FORMTEXT} MS field, but practical implementation was
missing.

Change-Id: Ifd17a523e253555a240f853bea5f21572d90d853
Reviewed-on: https://gerrit.libreoffice.org/70786Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
(cherry picked from commit b01a4437)
Reviewed-on: https://gerrit.libreoffice.org/71402
Tested-by: Jenkins