Fix testing loop in Active Learning

[Dref360]

What does this PR do?

Test metrics were not logged correctly.

Fixes # (issue)

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[codecov]

Codecov Report

Merging #879 (685bfaf) into master (e63a9a1) will decrease coverage by 0.06%.
The diff coverage is 10.00%.

@@            Coverage Diff             @@
##           master     #879      +/-   ##
==========================================
- Coverage   89.08%   89.01%   -0.07%     
==========================================
  Files         230      230              
  Lines       12708    12719      +11     
==========================================
+ Hits        11321    11322       +1     
- Misses       1387     1397      +10     

Flag	Coverage Δ
unittests	89.01% <10.00%> (-0.07%)	⬇️

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

Impacted Files	Coverage Δ
...ash/image/classification/integrations/baal/data.py	41.48% <0.00%> (+1.28%)	⬆️
...ash/image/classification/integrations/baal/loop.py	31.73% <10.52%> (-3.83%)	⬇️

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[tchaton]

LGTM !

[Dref360]

Hello, anything missing on this? Once this is merged, I'll update our example on BaaL and finalize the blog post.

[ethanwharris]

Awesome, LGTM 😃