The timestamp field on kafka messages is not set properly

On messages returned from kafka.Client.query, the timestamp field is not set to the timestamp.

For example:

>>> msg
Message(topic='gstlal.rick_o4b.events', partition=0, offset=24676261, key=('heartbeat',), value={'time': 1411931848}, timestamp=1)

The problem is the index on: https://git.ligo.org/gstlal-visualisation/ligo-scald/-/blob/main/ligo/scald/io/kafka.py?ref_type=heads#L108

I tested in a container, simply changing the 0 to a 1 fixes the issue.