Only allow >=DistrictAdmin to clear home facility

[Ashesh3]

According to issue coronasafe/care_fe#4820 , only user with district admin or above access (not read-only users) should be able to clear the home facility from a user. They are the same set of users who can link facilities and set home facilities.

This PR changes the permissions required to clear the home facility to allow only >=DistrictAdmin excluding the read only user types.

@coronasafe/code-reviewers

[gigincg]

@Ashesh3 But a District Admin should not be able to clear access for a State Admin. Is that edge handled here?

[Ashesh3]

@Ashesh3 But a District Admin should not be able to clear access for a State Admin. Is that edge handled here?

Should be fixed. I didn't infer the edge case from the linked issue which stated that any user >= District admin should be able to clear home facility of any other user.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Base: 56.05% // Head: 56.04% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (71bdab6) compared to base (a55502e).
Patch coverage: 33.33% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1198      +/-   ##
==========================================
- Coverage   56.05%   56.04%   -0.01%     
==========================================
  Files         174      174              
  Lines        8788     8791       +3     
  Branches     1515     1516       +1     
==========================================
+ Hits         4926     4927       +1     
- Misses       3808     3810       +2     
  Partials       54       54              

Impacted Files	Coverage Δ
care/users/api/viewsets/users.py	51.68% <33.33%> (-0.32%)	⬇️

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