fix(login): fix bad login redirection when request admin panel

[jacquesfize]

Improve #3305

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.00%. Comparing base (5e166f3) to head (548ba0e).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
backend/geonature/core/errors.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3322      +/-   ##
===========================================
+ Coverage    83.93%   84.00%   +0.06%     
===========================================
  Files          122      122              
  Lines         9719     9714       -5     
===========================================
+ Hits          8158     8160       +2     
+ Misses        1561     1554       -7     

Flag	Coverage Δ
pytest	84.00% <0.00%> (+0.06%)	⬆️

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