message: Simplify init response build
diff: @@ -10,12 +10,7 @@ pub const VERSION: &str = "crypto-verify-v1";
  #[entry_point]
  pub fn init(_deps: DepsMut, _env: Env, _info: MessageInfo, _msg: InitMsg) -> StdResult<Response> {
  - // Does nothing
  - Ok(Response {
  - messages: vec![],
  - attributes: vec![attr("action", "init")],
  - data: None,
  - })
  + Ok(Response::default())
  }
  #[entry_point]
  