Apply transform in FilePathDataset

[ibraheemmmoosa]

Transforms were not applied to image in FilePathDataset.

What does this PR do?

Fixes #96 96

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[teddykoker]

Good catch, thanks!

[codecov]

Codecov Report

Merging #97 (d46b7d2) into master (6c047f0) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
+ Coverage   86.64%   86.66%   +0.01%     
==========================================
  Files          45       45              
  Lines        1370     1372       +2     
==========================================
+ Hits         1187     1189       +2     
  Misses        183      183              

Flag	Coverage Δ
unittests	86.66% <100.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
flash/vision/classification/data.py	78.12% <100.00%> (+0.34%)	⬆️

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