Update `ImageToTextPipelineTests.test_small_model_tf`
# What does this PR do?

After PR #19732, I uploaded the correctly converted TF model to the Hub repo [hf-internal-testing/tiny-random-vit-gpt2](https://huggingface.co/hf-internal-testing/tiny-random-vit-gpt2/tree/main)

This PR updates the expected values accordingly, which is the same values as for `test_small_model_pt`.
Thank you so much for this @ydshieh !!<|||||>_The documentation is not available anymore as the PR was closed or merged._<|||||>Thanks!