refactor(activation): switch SIA activation to the enable request

[takenagain]

Switches TSIA activation to use the enable function with the RPC request structure, as discussed.

{
    "userpass": "{{userpass}}",
    "method": "enable",
    "coin": "TSIA",
    "tx_history": true,
    "client_conf": {
        "server_url": "https://sia-walletd.komodo.earth/",
        "password": "dummy"
    }
}