Remove unnecessary code in BaseOutputHandler (#2439)

Closes #2438

ignite/contrib/handlers/base_logger.py

@@ -105,7 +105,7 @@ def _setup_output_metrics_state_attrs(
             if not isinstance(output_dict, dict):
                 output_dict = {"output": output_dict}
 
-            metrics_state_attrs.update({name: value for name, value in output_dict.items()})
+            metrics_state_attrs.update(output_dict)
 
         if self.state_attributes is not None:
             metrics_state_attrs.update({name: getattr(engine.state, name, None) for name in self.state_attributes})