Fix z op payload

[shadowv0vshadow]

Set z payload index from str to int. both all can pass and custom color. int will better.

payload = {
"6787f39b5d2fc020eb0f8e68cd925f297065c5c82c86d175cce1a9beaa411239i0": {
    1: 546
  }
}

payload = {
"6787f39b5d2fc020eb0f8e68cd925f297065c5c82c86d175cce1a9beaa411239i0": {
    "1": 546
  }
}

Both payloads are compatible with custom colored operations.