API v3: Secure API does not accept string ID

[quentinlesceller]

Similar to #312 except a bit more annoying this time.
Once initialized, the secure API does not accept ID as string.

{ 
   "id":"3",
   "jsonrpc":"2.0",
   "method":"encrypted_request_v3",
   "params":{ 
      "nonce":"2994319f73303015805b22c3",
      "body_enc":"M1X8zvf0MTjJ8uYkEOWlxKcRvz16g+PtiKNdttYddlMapOzGi8gV7yJrsOYdDkaLhVP3Y3o8LTGuVW56EpV+s8Tjgxy9DWoPIiW1vMm5V0ITvXX2enZVgswmkvNjnkhjTB1tydpv"
   }
}
{
  "error": {
    "code": -32002,
    "message": "Encrypted request format error: invalid type: string \"3\", expected u32"
  },
  "id": 1,
  "jsonrpc": "2.0"
}

[quentinlesceller]

Preparing a PR for that one.

[yeastplume]

Fixed via PR