[pre-commit.ci] auto fixes from pre-commit.com hooks

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pytorch_lightning/trainer/training_loop.py

@@ -271,9 +271,8 @@ def _check_training_step_output(self, training_step_output):
                 raise MisconfigurationException("In manual optimization, `training_step` should not return a Tensor")
         elif self.trainer.automatic_optimization:
             if not (
-                isinstance(training_step_output, torch.Tensor) or (
-                    isinstance(training_step_output, Mapping) and 'loss' in training_step_output
-                )
+                isinstance(training_step_output, torch.Tensor) or
+                (isinstance(training_step_output, Mapping) and 'loss' in training_step_output)
             ):
                 raise MisconfigurationException(
                     "In automatic optimization, `training_step` must either return a Tensor, "