Nedis air quality: add name to VOC sensor for back compatibility.

To avoid the entity id changing.

Issue #1601

custom_components/tuya_local/devices/nedis_airquality.yaml

@@ -38,6 +38,7 @@ secondary_entities:
         mapping:
           - scale: 10
   - entity: sensor
+    name: Volatile organic compounds
     class: volatile_organic_compounds_parts
     dps:
       - id: 21