Revert "Preselect interface subnet mask for carp interfaces"
Revert "Preselect interface subnet mask for carp interfaces"

This was not a good change, it just consider ipv4, and it doesn't
respect the previous selected value. Revert it now and think on a better
solution later.

Fixes #2829

This reverts commit d94eb904462b149998e6cb5bf260922923cbf465.

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