[#1063] Migrate core/confirmation.go to use updated wallet-interface
[#1063] Migrate core/confirmation.go to use updated wallet-interface

OpenBazaar/openbazaar-go,gubatron/openbazaar-go,OpenBazaar/openbazaar-go,OpenBazaar/openbazaar-go,gubatron/openbazaar-go,gubatron/openbazaar-go