simplify logic in ScFuncDesc::getFormula
simplify logic in ScFuncDesc::getFormula

Change-Id: I05fd812d1fd76e57d5305d859b2ad64d471adfb1

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