TST: Make Stain Norm CLI Tests Use Temp Dir

[John-P]

Fix the stain normalisation CLI test which would dump output into the project root directory by specifying an output to a temporary test directory.

[shaneahmed]

Thanks @John-P Looks fine to me.

[codecov]

Codecov Report

Merging #319 (8162ce7) into develop (40b1e1a) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #319      +/-   ##
===========================================
- Coverage    99.84%   99.84%   -0.01%     
===========================================
  Files           55       55              
  Lines         5169     5168       -1     
  Branches       877      876       -1     
===========================================
- Hits          5161     5160       -1     
  Misses           2        2              
  Partials         6        6              

Impacted Files	Coverage Δ
tiatoolbox/models/__init__.py	100.00% <ø> (ø)
tiatoolbox/models/architecture/hovernetplus.py	100.00% <ø> (ø)
tiatoolbox/models/architecture/idars.py	100.00% <ø> (ø)
tiatoolbox/models/architecture/micronet.py	100.00% <ø> (ø)
tiatoolbox/visualization/tileserver.py	100.00% <ø> (ø)
tiatoolbox/data/__init__.py	100.00% <100.00%> (ø)

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