`votingStarted` is not set in `api/agendas` response

[ukane-philemon]

The API response from https://dcrdata.decred.org/api/agendas is missing the votingStarted value.

{
    "name": "changesubsidysplitr2",
    "description": "Change block reward subsidy split to 1/89/10 as defined in DCP0012",
    "status": "finished",
    "votingStarted": 0,
    "votingdone": 786303,
    "activated": 794368,
    "hardforked": 0,
    "starttime": "2023-04-24T00:00:00Z",
    "expiretime": "2025-04-24T00:00:00Z",
    "voteversion": 10,
    "mask": 96
  }