CppunitTest_sd_export_tests: fix validation errors
CppunitTest_sd_export_tests: fix validation errors

Regression from 3e4d2043e99201ec542186039e3be34d3c226111 (tdf#90190 PPTX
table cell border width is not exported., 2015-04-16).

Change-Id: I9ccbfe32a068ea787f1bb5c62034a54f2a5996aa

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core