Disable loading of admin-index fixture in testing

[swrichards]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 45.45455% with 6 lines in your changes missing coverage. Please review.

Project coverage is 95.09%. Comparing base (451e3b4) to head (a33cc07).
Report is 2 commits behind head on develop.

Files	Patch %	Lines
src/open_inwoner/accounts/apps.py	40.00%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1330   +/-   ##
========================================
  Coverage    95.09%   95.09%           
========================================
  Files          993      992    -1     
  Lines        36184    36164   -20     
========================================
- Hits         34408    34389   -19     
+ Misses        1776     1775    -1     

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