Related fdo#47802: Bring the 8bit and 16bit .doc on par.
Related fdo#47802: Bring the 8bit and 16bit .doc on par.

The code expects that sTxt holds both the cbTextBefore and cbTextAfter, so
let's make it so in the 16bit format too.

This fixes assertion in doc/fdo47802-3.doc.

Change-Id: I35cc7c1e80a33f013ab2eaae073b111214245e25

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