Re-add binary_sensor attribute for AlarmDecoder that was inadverten…

…tly removed (#62351)

homeassistant/components/alarmdecoder/binary_sensor.py

@@ -81,6 +81,9 @@ def __init__(
         self._relay_addr = relay_addr
         self._relay_chan = relay_chan
         self._attr_device_class = zone_type
+        self._attr_extra_state_attributes = {
+            CONF_ZONE_NUMBER: self._zone_number,
+        }
 
     async def async_added_to_hass(self):
         """Register callbacks."""