Revert D27710107: [pytorch][PR] Update a `batch_first` arg for transformers like GRU and LSTM.
Test Plan: revert-hammer
Differential Revision:
D27710107 (https://github.com/pytorch/pytorch/commit/2237754b13dcb5807aba7e64ffa509cf193eda83)
Original commit changeset: c4363a460454
fbshipit-source-id: 5387b5deae6db43f17a7d5e0408a7d24e463d73a
