Swap PATHS for FOLDERS and FILES and change TENSOR -> TENSORS

[ethanwharris]

What does this PR do?

Fixes # (issue)

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[codecov]

Codecov Report

Merging #289 (99c5555) into master (87bdb09) will decrease coverage by 3.96%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
- Coverage   88.22%   84.25%   -3.97%     
==========================================
  Files          74       74              
  Lines        3574     3575       +1     
==========================================
- Hits         3153     3012     -141     
- Misses        421      563     +142     

Flag	Coverage Δ
unittests	84.25% <100.00%> (-3.97%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/data/data_module.py	90.90% <ø> (-1.44%)	⬇️
flash/video/classification/data.py	76.05% <ø> (-5.64%)	⬇️
flash/vision/classification/data.py	92.30% <ø> (-1.10%)	⬇️
flash/vision/detection/data.py	97.18% <ø> (ø)
flash/vision/segmentation/data.py	88.63% <ø> (ø)
flash/data/data_source.py	94.30% <100.00%> (-2.42%)	⬇️
flash/vision/embedding/model.py	65.38% <100.00%> (ø)
flash/text/seq2seq/core/data.py	44.44% <0.00%> (-43.06%)	⬇️
flash/video/classification/model.py	50.00% <0.00%> (-37.84%)	⬇️
flash/text/classification/data.py	56.04% <0.00%> (-31.87%)	⬇️
... and 13 more

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