fix nit formatting in generate actions fcn

src/lerobot/policies/multi_task_dit/modeling_multi_task_dit.py

@@ -112,9 +112,10 @@ class MultiTaskDiTPolicy(PreTrainedPolicy):
         conditioning_vec = self.observation_encoder.encode(batch)
         actions = self.objective.conditional_sample(self.noise_predictor, batch_size, conditioning_vec)
 
-        start_idx = n_obs_steps - 1
-        end_idx = start_idx + self.config.n_action_steps
-        return actions[:, start_idx:end_idx]
+        start = n_obs_steps - 1
+        end = start + self.config.n_action_steps
+        actions = actions[:, start:end]
+        return actions
 
     def reset(self):
         """Clear observation and action queues. Should be called on `env.reset()`"""