tdf#118117 sc pivottable: STR_PIVOT_DATA is an existing name too

tdf#118117 sc pivottable: STR_PIVOT_DATA is an existing name too

This fixes a LO 6.0 regression from
commit a078328e91ab9cbd78a92608c1abdc2c57ff9ac5

I looked for existing unit test examples using
assert (rLabel != ScResId(STR_PIVOT_DATA));
but found nothing.

I don't see the need for a unit test here.
The whole pivot table is messed up if you duplicate
a label, so why bother testing. It just is not
as bad now as it was before.

Change-Id: I59cc73becf91f766a29d2007c2d67685ffa2a65c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130751
Tested-by: Jenkins
Reviewed-by: Justin Luth <jluth@mail.com>
(cherry picked from commit b7f654a406b704f469d1df424d83a3d98ae46432)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130784
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>