Reduce Funnel PT/TF diff
# What does this PR do?

Same as #15684, but on PT test side.

As mentioned in #15684, this is not a real bug in model. Just a setting in the test configuration.

## Comment

The change in `modeling_tf_funnel.py` is to address **a real issue** regarding **weight initialization**, see

https://github.com/huggingface/transformers/blob/15de7a010ddcdec0532b30d1eb6c28e7b314a6a9/src/transformers/models/funnel/configuration_funnel.py#L79-L84
and
https://github.com/huggingface/transformers/blob/15de7a010ddcdec0532b30d1eb6c28e7b314a6a9/src/transformers/models/funnel/modeling_funnel.py#L812-L814

**(But, this issue is not the cause of the large diff between PT/TF)**
_The documentation is not available anymore as the PR was closed or merged._