Fix interface write_config message for dhclient_update_gateway_groups_defaultroute
Fix interface write_config message for dhclient_update_gateway_groups_defaultroute

Typo in var name.
ptorsten/pfsense,BlackstarGroup/pfsense,ch1c4um/pfsense,phil-davis/pfsense,brunostein/pfsense,dennypage/pfsense,pfsense/pfsense,ch1c4um/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,dennypage/pfsense,ch1c4um/pfsense,ch1c4um/pfsense,brunostein/pfsense,jxmx/pfsense,BlackstarGroup/pfsense,dennypage/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,NOYB/pfsense,pfsense/pfsense,jxmx/pfsense,phil-davis/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,NewEraCracker/pfsense,NOYB/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,pfsense/pfsense,pfsense/pfsense,NOYB/pfsense,BlackstarGroup/pfsense,brunostein/pfsense,jxmx/pfsense,dennypage/pfsense