Fix -b flag for cleos get table subcommand

[johndebord]

In reference to issue #7362 passing the -b flag is sufficient for retrieving the table row in binary format.

---

Before

cleos get table eosio.token eosio accounts -b

{
  "rows": [{
      "balance": "0.0000 SYS"
    }
  ],
  "more": false
}

---

After

cleos get table eosio.token eosio accounts -b

{
  "rows": [
    "00000000000000000453595300000000"
  ],
  "more": false
}