Fix incorrect comment copied from previous function (#429)

assets/erc-3448/MetaProxyFactory.sol

@@ -85,7 +85,7 @@ contract MetaProxyFactory {
  mstore(ptr, length)
  ptr := add(ptr, 32)
 
- // The size is deploy code + contract code + calldatasize - 4 + 32.
+ // The size is deploy code + contract code + length + 32.
  addr := create(0, start, sub(ptr, start))
  }
  }