Fix typos and correctly test for the <enable/> setting on optional interfaces.
Fix typos and correctly test for the <enable/> setting on optional interfaces.

phil-davis/pfsense,jxmx/pfsense,brunostein/pfsense,pfsense/pfsense,NewEraCracker/pfsense,BlackstarGroup/pfsense,phil-davis/pfsense,pfsense/pfsense,ch1c4um/pfsense,brunostein/pfsense,BlackstarGroup/pfsense,pfsense/pfsense,ch1c4um/pfsense,brunostein/pfsense,dennypage/pfsense,jxmx/pfsense,NewEraCracker/pfsense,ch1c4um/pfsense,dennypage/pfsense,jxmx/pfsense,NOYB/pfsense,NOYB/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,ch1c4um/pfsense,dennypage/pfsense,phil-davis/pfsense,pfsense/pfsense,BlackstarGroup/pfsense,BlackstarGroup/pfsense,ptorsten/pfsense,dennypage/pfsense,NewEraCracker/pfsense,NOYB/pfsense,ptorsten/pfsense,ptorsten/pfsense