Fixes shuffle + collate

[AbhinavTuli]

🚀 🚀 Pull Request

Checklist:

• My code follows the style guidelines of this project and the Contributing document
• I have commented my code, particularly in hard-to-understand areas
• I have kept the coverage-rate up
• I have performed a self-review of my own code and resolved any problems
• I have checked to ensure there aren't any other open Pull Requests for the same change
• I have described and made corresponding changes to the relevant documentation
• New and existing unit tests pass locally with my changes

Changes

In case of shuffled dataloader, we were collating twice, leading to issues. This fixes it.

[codecov]

Codecov Report

Merging #1552 (a4ca7c3) into main (ff63116) will decrease coverage by 0.04%.
The diff coverage is 74.50%.

@@            Coverage Diff             @@
##             main    #1552      +/-   ##
==========================================
- Coverage   92.48%   92.44%   -0.05%     
==========================================
  Files         200      200              
  Lines       18228    18265      +37     
==========================================
+ Hits        16859    16885      +26     
- Misses       1369     1380      +11     

Flag	Coverage Δ
unittests	92.44% <74.50%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
hub/integrations/pytorch/pytorch.py	86.66% <ø> (ø)
hub/integrations/tests/test_pytorch_dataloader.py	95.69% <ø> (ø)
hub/integrations/pytorch/dataset.py	89.05% <59.09%> (-2.32%)	⬇️
hub/integrations/pytorch/shuffle_buffer.py	89.13% <60.00%> (-3.90%)	⬇️
hub/integrations/tests/test_pytorch.py	99.46% <91.66%> (-0.54%)	⬇️

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