fix awaiting_approval list bug

[antgonza]

No description provided.

[codecov-io]

Codecov Report

Merging #2296 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #2296      +/-   ##
==========================================
+ Coverage   93.75%   93.76%   +<.01%     
==========================================
  Files         163      163              
  Lines       18535    18550      +15     
==========================================
+ Hits        17378    17393      +15     
  Misses       1157     1157

Impacted Files	Coverage Δ
...ta_pet/handlers/study_handlers/listing_handlers.py	90% <ø> (ø)	⬆️
...lers/study_handlers/tests/test_listing_handlers.py	99.36% <100%> (+0.06%)	⬆️

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