Verify Klaytn + Covalent detecting of NFT token IDs is still correct

[hboon]

A little different from what is described in AlphaWallet/alpha-wallet-ios#4191:

ev.tokenID = logParams.values().iterator().next().valueBI.toString();

It can be read from tokenId instead of value and this comment in the iOS PR https://github.com/AlphaWallet/alpha-wallet-ios/pull/5094/files#diff-5b743bac24c0d35ba865cb65b26472d247e6b6132c2d2360f9293bd6bd34c9daR160 :

//`tokenId`s in Covalent don't start with 0x, but `value`s does

[JamesSmartCell]

Nice, thanks for spotting this, have seen some Klaytn NFT weirdness over the past couple of weeks but didn't investigate further.