Fix in_progress attribute for Home Assistant update sensor

[Laxilef]

I made a mistake in my last PR #19207
The value "false" (in quotes) is recognized as true in Home Assistant. Fixed in this PR.

[Koenkk]

Thanks!

[derekoharrow]

I'm running the latest dev release 1.33.2-dev commit: [1fd1686]

I'm seeing lots of messages in the HA log file that appear to be caused by this:

2023-11-06 11:47:12.827 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:23.528 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:38.697 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:39.083 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:41.737 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:42.168 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:51.285 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:54.290 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:55.537 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:47:57.537 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:48:04.517 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}
2023-11-06 11:48:05.944 WARNING (MainThread) [homeassistant.components.mqtt.mixins] Erroneous JSON: {"in_progress": False}