set ok as default button for mail merge dialog
set ok as default button for mail merge dialog

Change-Id: I2b1a20abb52a2ccc07f77a878b4b9e68c301a5f7

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