Approval query returns positive for Owner

[orkunkl]

In an NFT project i had this case:

        // check if sender has approval
        nft_contract
            .approval(
                &deps.querier,
                token.id.clone(),
                info.sender.clone().into_string(),
                None,
            )
            .map_err(|_e| ContractError::Unauthorized {})?;

Where I only want to check if sender has permission to operate nft.
If the sender is owner, this query returns unauthorized. In order to make this work, I need to run one more owner query which makes things complicated and expensive.

[the-frey]

Looks good - suggest we merge #48 first, then the wasm build will succeed here and #45