[mqtt.generic] Fix ClassCastException
when receiving ON/OFF on a dimmer channel
#17980
+3
−1
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A dimmer channel used to be able to receive
ON
/OFF
through MQTT in openHAB 4.2. This broke in 4.3.Reported here: https://community.openhab.org/t/openhab-4-3-release-discussion/160888/192
This needs to be backported to 4.3.x
Fixes #17968