Typo Fix for Default Example Inputs to MobilenetV2 Export

[BujSet]

Summary

PR forgot to change the return example input to use the default samoyed dog image when using real inputs. This PR fixes that typo.

Test plan

Now the example runners that use the mv2 export contain the dog image in the pte by default.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13206

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❌ 2 New Failures, 1 Unrelated Failure

As of commit 4b423b7 with merge base afdbb85 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3caaea8b76e0c341ed7addef7f582e3964da38ccba98966e154b1bd8f45e2828 /exec failed with exit code 1

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-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'

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[BujSet]

@pytorchbot label "release notes: none"