Entity naming: modify logic for use_device_name

Last change seems to have made things worse, as lights are now getting
None appended as well, even with no class or translation_key.

Issue #1856

custom_components/tuya_local/helpers/mixin.py

@@ -60,10 +60,7 @@ def use_device_name(self):
         own_name = (
             self._config.name
             or self._config.translation_key
-            or (
-                self._default_to_device_class_name
-                and not self._config.translation_only_key
-            )
+            or (self._default_to_device_class_name and self._config.device_class)
         )
         return not own_name