writerfilter: remove misleading prefix of non-member variables
writerfilter: remove misleading prefix of non-member variables

Change-Id: I8c1883de9acf1d66f4fc5cb994a3cb97103789a6

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