message: [examples/model] Remove commented-out code
diff: @@ -66,10 +66,7 @@ fn instantiate() -> impl Contract {
  .on_msg::<BalanceOf>(|env, owner| {
  env.state.balances[&owner]
  })
  - .on_msg_mut::<Transfer>(|env, (to, amount)| {
  - // if amount == Address::from(0x0) { // In Substrate we do not have the zero address!
  - // return false;
  - // }
  + .on_msg_mut::<Transfer>(|env, (to: Address, amount: Address)| {
  let from = env.caller();
  let balance_from = env.state.balances[&from];
  let balance_to = env.state.balances[&to];
  