fix (meaco_clean_purifier): leave light available in sleep mode

Apparently the light temporarily turns on to show changes in sleep mode,
so it is not necessary to mark it unavailable.

Comment on commit e3595bd3

custom_components/tuya_local/devices/meaco_clean_purifier.yaml

@@ -132,10 +132,3 @@ entities:
             value: 128
           - dps_val: Standard
             value: 255
-      - id: 3
-        type: string
-        name: available
-        mapping:
-          - dps_val: sleep
-            value: false
-          - value: true