Address returned inside struct uses hex encoding instead of CIP-37 format

Address returned inside struct uses hex encoding instead of CIP-37 format.

```solidity
struct TokenInfo {
    uint256 tokenId;
    address owner;
}

function get() external view returns (TokenInfo) {
  return TokenInfo(1, address(0));
}
```

```js
const info = await contract.get();
console.log(info.owner);
```