Minor bug for `frame_skip` at `AtariPreprocessing`
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Description
When setting `frame_skip=1` in the `AtariPreprocessing`, we will always have `t=1` in the *step* function (line 475 of `atari_lib.py`). And so, `self.screen_buffer[0]` never gets updated.
Now considering the `_pool_and_resize` when `frame_skip` is one, `transformed_image` is exactly the resized `self.screen_buffer[0]`, and so, it will never change in the entire episode.
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