DOCX export: Enhance the style inheritance unit test for docDefaults.
DOCX export: Enhance the style inheritance unit test for docDefaults.

Change-Id: I839cbd6b3499f77867f993ece9f764db8f1c18c3

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