message: [pdsl_model] Remove some printlns
diff: @@ -41,15 +41,12 @@ messages! {
  fn instantiate() -> impl TestableContract {
  ContractDecl::using::<Adder>()
  .on_deploy(|env, init_val| {
  - println!("Incrementer::on_deploy");
  env.state.val.set(init_val)
  })
  .on_msg_mut::<Inc>(|env, by| {
  - println!("Incrementer::inc");
  env.state.val += by
  })
  .on_msg::<Get>(|env, _| {
  - println!("Incrementer::get -> {:?}", *env.state.val.get());
  *env.state.val.get()
  })
  .instantiate()
  