tdf#82802 sw conditional style conditions not saved for TextBody

tdf#82802 sw conditional style conditions not saved for TextBody

Someone thought it would be a good idea for the
built-in paragraph style Text Body to be special
and support conditional formatting.
It has been broken for import/export since 2015.

It was mostly fixed in duplicate issue tdf#103091,
but the side case of Text Body was missed.

Partially reverting commit a5b4cb3f836c991d0647f55e1ef4920ce6115eac.
xNewStyle didn't need to be a member variable
since it is assigned to GetStyle anyway.

Change-Id: I102d86c0b1f28e42b2c1350abc247b6b1f8acd4e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107352
Tested-by: Justin Luth <justin_luth@sil.org>
Reviewed-by: Justin Luth <justin_luth@sil.org>
Reviewed-by: Michael Stahl <michael.stahl@cib.de>