CppunitTest_sw_ooxmlexport2: clean up test file

This test file wants to test table positioning, but it also has
references to table styles. Remove these references to keep the testcase
minimal.

Change-Id: Ib7c7086bf767a8580dd7bae4452d0773e02d32a2
DOCX export: fix missing table border when original doc has table style

Scenario is that the original document has a table style, which sets
borders around the table, so A1 cell gets top and left borders (and none
for right/bottom). Then on export, if we write A1 as table default, then
this overwrites the table style, so the real right / bottom borders from
the table style are lost, as on export we think that they are available
from the table style already, so we don't write them.

Regression from commit ae61569eea0719a882010cfbb260a1a0d690d974 (oox: Do
not overwrite table style properties, 2014-04-03).

Change-Id: I54c10ffc2ade65260693b769274b1311efc086f9