cleanup(entity): remove unused import

After a lot of back and forth on deprecation logging, some left over
imports remained.

custom_components/tuya_local/entity.py

@@ -9,7 +9,6 @@ from homeassistant.const import (
     UnitOfArea,
     UnitOfTemperature,
 )
-from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers.entity import EntityCategory
 
 _LOGGER = logging.getLogger(__name__)