Fix DQN w RNN tutorial

[svekars]

Fixes #3450
Fixes https://github.com/pytorch/tutorials/actions/runs/16273680500/job/45947334373?pr=3416#step:9:8137

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3462

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❌ 2 New Failures

As of commit 5e85c0a with merge base 9a44439 ():

NEW FAILURES - The following jobs have failed:

• Build tutorials / pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu) (gh)
  RuntimeError: Expected input at *args[0].shape[0] to be equal to 1, but got 2. If you meant for this dimension to be dynamic, please re-export and specify dynamic_shapes (e.g. with Dim.DYNAMIC)
• Build tutorials / pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu) (gh)
  Process completed with exit code 2.

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[svekars]

@vmoens ^^