fix: when window_size is passes as array
Author: dotneet
Pull request: yes

# What does this PR do?

The window_size should have been implemented to allow separate values for height and width, but it was not working. This fixes that problem.

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Comments:
@ArthurZucker 
Thanks for the reply.

See the existing code here.
https://github.com/huggingface/transformers/blob/21dc5859421cf0d7d82d374b10f533611745a8c5/src/transformers/models/swinv2/modeling_swinv2.py#L437

Originally, window_size was obviously an implementation that could be passed as an array.
However, due to some code, it was not possible to actually pass the array. I fixed that.

I want to train optimized for horizontal images, not square images. To do this, I believe image_size, patch_size, and window_size would all need to be set to separate values for height and width. I don't think this is a rare case.

In fact, there are people who need it here in the repository.

https://github.com/microsoft/Swin-Transformer/issues/44
https://github.com/microsoft/Swin-Transformer/issues/141


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