Mustool MT15/29: use correct syntax for mapping

custom_components/tuya_local/devices/mustool_mt15mt29_airbox.yaml

@@ -149,9 +149,9 @@ entities:
             value: 64
           - dps_val: level_2
             value: 128
-          - dps_value: level_3
+          - dps_val: level_3
             value: 192
-          - dps_value: level_4
+          - dps_val: level_4
             value: 255
   - entity: number
     name: CO2 alarm threshold