base58_tests: update base58_keys_valid.json with peercoin keys
base58_tests: update base58_keys_valid.json with peercoin keys

peercoin/peercoin,glv2/peerunity,glv2/peerunity,DigitalPandacoin/pandacoin,peercoin/peercoin,glv2/peerunity,ppcoin/ppcoin,peercoin/peercoin,ppcoin/ppcoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,ppcoin/ppcoin,DigitalPandacoin/pandacoin,peercoin/peercoin,glv2/peerunity,peercoin/peercoin,ppcoin/ppcoin,peercoin/peercoin