Fix #6982: Remove wrong global definition of use_filterdns and pass it as reference
Fix #6982: Remove wrong global definition of use_filterdns and pass it as reference

NOYB/pfsense,brunostein/pfsense,pfsense/pfsense,phil-davis/pfsense,brunostein/pfsense,NOYB/pfsense,jxmx/pfsense,pfsense/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,pfsense/pfsense,dennypage/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,NOYB/pfsense,brunostein/pfsense,jxmx/pfsense,dennypage/pfsense,phil-davis/pfsense,ptorsten/pfsense,dennypage/pfsense,dennypage/pfsense,NewEraCracker/pfsense,jxmx/pfsense,ptorsten/pfsense,phil-davis/pfsense,pfsense/pfsense,NewEraCracker/pfsense