Reverted, just fixed backlight flushing

gaugemqttcontinuous.py

@@ -356,11 +356,7 @@ def _flush_backlight(client):
             },
             "brightness": int(backlight_brightness[i] * 2.55),
         }
-        client.publish(
-            f"{gt['set'].replace('/set', '/backlight/state')}",
-            ujson.dumps(payload),
-            retain=True,
-        )
+        client.publish(gt["led_bl_state"], ujson.dumps(payload), retain=True)
         info(
             f"Gauge {i} backlight: {payload['state']} {backlight_color[i]} @ {backlight_brightness[i]}%"
         )