Remove ENV_LOADED from test class

[adamchainz]

Unused since the test was refactored to use an alternative DOTENV_LOADED attribute: adamchainz@27eb748#diff-fdfcd5f2f4243e852388648dd8f442958a8df44c9d883c568d4380163b4164ecL10

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.37%. Comparing base (f37ed87) to head (cec5f74).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #398      +/-   ##
==========================================
- Coverage   90.39%   90.37%   -0.02%     
==========================================
  Files          25       25              
  Lines        1197     1195       -2     
  Branches       86       86              
==========================================
- Hits         1082     1080       -2     
  Misses         88       88              
  Partials       27       27              

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