fdo#54651: Only pick non-default number format for pivot field.
fdo#54651: Only pick non-default number format for pivot field.

Change-Id: Ia88282803c8df8389ed24efd8b1ca7600a39bf23

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