Fix Qwen export command backslashes

[jackzhxng]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12181

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❌ 1 New Failure, 1 Cancelled Job, 1 Unrelated Failure

As of commit 0aa255b with merge base 02454eb ():

NEW FAILURE - The following job has failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 224fa356b1cb2f65b29af76d8fdb8e841ac7af929d7b5eb6a5235b09b09fd1ec /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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