Wallet: Change IsMine check in CWallet::DelAddressBook from assert to failure
Wallet: Change IsMine check in CWallet::DelAddressBook from assert to failure

Former-commit-id: 681aba615d4e0d7c2cb82773e79e9fd406ef01c2
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin