Fixes discharged patients CSV export

[rithviknishad]

Warning

Base branch is staging

Proposed Changes

• Fixed queryset filter logic to allow for CSV exports, resulting in an empty list for discharged patients.

Associated Issue

• Fixes Discharge patients CSV export results in empty list #2008

Screenshots

Discharged Patients List and Export

Live Patients List and Export

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete
• Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 62.36%. Comparing base (8358849) to head (2f5de5d).

Files	Patch %	Lines
care/facility/api/viewsets/patient.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2009      +/-   ##
===========================================
- Coverage    62.37%   62.36%   -0.01%     
===========================================
  Files          221      221              
  Lines        12225    12226       +1     
  Branches      1746     1746              
===========================================
  Hits          7625     7625              
- Misses        4284     4285       +1     
  Partials       316      316              

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