signTyped Data is wrong on Trust wallet

[williamchong]

now we disabled sending p2p in Trust wallet, because it generate different sign of our signTypedData payload vs Metamask

after investigating, 2 problems were found

1. signing uint256 of 1 000 and 1000 generates different result in Trust , but same is Metamask. Not sure spec favor which behaviour, but a quick fix would be detect Trust and remove spacings

2. cannot sign { type: 'uint256', name: 'nonce', value: nonce }, correctly, but in fact we put a hex string into this field
   https://github.com/likecoin/likecoin-store/blob/9f2a60a10e45169ef5bd18fd9623e3d851a8d713/util/EthHelper.js#L372
   maybe it should be a random number with dec based toString() instead?

after fixing above problem, we can re-enabled p2p LIKE sending in at least ios Trust wallet