fix(evm): ucs01: revert invalid change in denom prefixing (#2729)

Revert changes made in https://github.com/unionlabs/union/pull/2672
where we wrongly switched the prefixing. See `onRecvPacket` function in
https://github.com/cosmos/ibc/tree/main/spec/app/ics-020-fungible-token-transfer:
```js
    // we are the source if the packets were prefixed by the sending chain
    // if the sender sends the tokens prefixed with their channel end's
    // port and channel identifiers then we are receiving tokens we 
    // previously had sent to the sender, thus we are receiving the tokens
    // as a source zone
    if isTracePrefixed(packet.sourcePort, packet.sourceChannel, token) {
```