remove django extra fields

[sainak]

Proposed Changes

• remove django extra fields

Associated Issue

Architecture changes

@coronasafe/code-reviewers

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (831c216) 56.66% compared to head (1bf7ea1) 56.66%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1354   +/-   ##
=======================================
  Coverage   56.66%   56.66%           
=======================================
  Files         195      195           
  Lines        9861     9861           
  Branches     1655     1655           
=======================================
  Hits         5588     5588           
  Misses       4219     4219           
  Partials       54       54           

Impacted Files	Coverage Δ
config/settings/base.py	90.78% <ø> (ø)

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