Revert "Handle PyTorch to Flax conversion of 1D convolutions"
Reverts huggingface/transformers#15519

@patil-suraj @sanchit-gandhi - please see comment on PR. Let me know if I'm mistaken there and we actually do need this new weight conversion, but I really don't see why this would be the case.
_The documentation is not available anymore as the PR was closed or merged._